Tollway Barrier Guidelines Examples Workshop V September-October 2015 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zoneq. Barrier Limits Check h. Clear Zone Adjustmentr. Barrier Obstacle i. Lateral Extent of the Area of Concerns. Compare Existing Length to Proposed j. Warrant Analysis Levelt. Prepare Warrant Text and Exhibits 2 Level 2 Example- Location 9 TOLLWAY PROJECT X-XX-XXXX Roadway Reconstruction Tollway M.P. 200 to M.P. 205 Barrier Warrant Analysis DATA SHEET Area of Concern: AOC NB-9 DESCRIPTION OF OBSTACLE Cantilever Sign Sta , 22.4 from EOTW to Centerline of Foundation Sign Foundation is 6-0 x 18-0 grade beam DESIGN CONCEPTS Design Speed = 70 MPH (Tollway Design Speed) ADT = 34,220 (2013) 3 Level 2 Example- Location 9 4 Each AOC should be analyzed separately a. Establish EOTW 5 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed 6 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT 7 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length 8 L2L2 Figure Approach Barrier Layout Variables LRLR 9 Level 2 Example- Location 9 10 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset 11 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope 12 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone 13 g. Clear Zone Select highest value in range Table 3-1 Clear Zone Distances in Feet from EOTW 14 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment 15 h. Clear Zone Adjustment 16 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern 17 i. Lateral Extent of the Area of Concern L2L2 Figure Approach Barrier Layout Variables LALA 18 Level 2 Example- Location 9 Lateral Extent of the Area of Concern L A = L A = 22.4 + 3.0 = 25.4 19 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 20 Flowchart for Analysis of Proposed Obstacles (Figure 5.5b) 21 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 22 k. Lateral Offset of Barrier L2L2 Figure Approach Barrier Layout Variables L2L2 23 Level 2 Example- Location 9 L A = 22.4 + 3.0 = 25.4 Lateral Offset of Barrier L 2 = L 2 = 1 + 11 + 1 = 13.0 24 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 25 Level 2 Example- Location 9 L A = 25.4 L 2 = 13.0 Y= Y = L Y = 13.0 Y = 13.69 26 l. Upstream End of Guardrail L2L2 Figure Approach Barrier Layout Variables X= (L A Y) / (L A / L R ) LALA LRLR L A - Y X 27 Level 2 Example- Location 9 L A = 25.4 L 2 = 13.0 Y = 13.69 L R = 360.0 Length of Need Formula Solve for X X = (L A Y) / (L A / L R ) X = (25.4 13.69) / (25.4 / 360.0) X = 28 l. Upstream End of Guardrail L2L2 Figure Approach Barrier Layout Variables Point of Need 29 Level 2 Example- Location 9 Point of Need PON = SF X PON = ( ) PON = ( ) 30 Level 2 Example- Location 9 Area of Concern (AOC) SF Southface_Foundation_Station = SF SF = ( ) L AOC = Length of AOC = 18.0 31 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 32 Level 2 Example- Location 9 Distance from back of guardrail to foundation= 25.4(L A )-6.0(Fnd.)-13.0(L 2 )-1.76(Depth of GR)= 4.64 Therefore, LON ends at downstream end of obstacle. Condition 1, TBG Figure Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 34 Level 2 Example- Location 9 (Distance from back of guardrail posts to foundation is 4.64. Therefore, LON includes 10 overlap (OL). Length of Need = LON = X + L AOC + OL LON=165.97 LON = 35 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 36 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 37 Level 2 Example- Location 9 Terminals Terminal = Type T2 T2 = 12.5 (does not count toward length of need) Terminal = Type T1 (Special) T1 = 46.88 (34.38 counts toward length of need) Barrier Limits Determination Length of Guardrail L Guardrail = LON T1(LON contribution) L Guardrail = 34.38 L Guardrail = L Guardrail, R = L Guardrail (Round up to the nearest 12.5 increment) L Guardrail, R = 162.5 38 Level 2 Example- Location 9 T2 End_Station = SF + L AOC + OL + T2 T2 End_Station = ( ) + 18 T2 End_Station = ( ) GR End_Station = Begin T2 Station = End T2 Station 12.5 GR End_Station = ( ) 12.5 GR End_Station = ( ) GR Begin_Station = GR End_Station L Guardrail,R GR Begin_Station = ( ) 162.5 GR Begin_Station = ( ) T1 Begin_Station = GR Begin_Station T1 T1 Station = ( ) 46.88 T1 Begin_Station = ( ) 39 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zoneq. Barrier Limits Check h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 40 Barrier Limits Check 12.5 < |PON- T1 Begin_Station |< 25 12.5 < |( ) ( )|< 25 12.5 < 15.41 < 25 41 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zoneq. Barrier Limits Check h. Clear Zone Adjustmentr. Barrier Obstacle i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 42 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zoneq. Barrier Limits Check h. Clear Zone Adjustmentr. Barrier Obstacle i. Lateral Extent of the Area of Concerns. Compare Existing Length to Proposed j. Warrant Analysis Level 43 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zoneq. Barrier Limits Check h. Clear Zone Adjustmentr. Barrier Obstacle i. Lateral Extent of the Area of Concerns. Compare Existing Length to Proposed j. Warrant Analysis Levelt. Prepare Warrant Text and Exhibits 44 Level 2 Example Location 9 Site Plan 45 Questions? 46 Level 2 Example- Location 17 TOLLWAY PROJECT X-XX-XXXX Roadway Rehabilitation Tollway M.P. 200 to M.P. 205 Barrier Warrant Analysis DATA SHEET Areas of Concern (AOC): EB-17A (Embankment Cone) and EB-17B (Bridge Pier) DESCRIPTION OF OBSTACLE Embankment Cone - Sta to Sta Blunt End of Crash wall at Bridge Sta , 11 from EOTW to Pier 47 Level 2 Example- Location 17 DESIGN CONCEPTS Existing guardrail and terminals do not meet current standards There is a crash wall in front of the bridge piers. Concrete Shoulder Barrier Transition (CSBT) is required per Structural Design Manual, Article 11.6, (35 length, Standard Drawing C4). Regrading of the bridge cone is not a feasible alternative. Design Speed = 60 MPH (Tollway Design Speed) ADT = 23,490 (2013) 48 Level 2 Example- Location 17 49 Each AOC should be analyzed separately a. Establish EOTW 50 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed 51 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT 52 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length 53 d. Runout Length L2L2 Figure Approach Barrier Layout Variables LRLR 54 d. Runout Length 55 Design Concepts Concrete Shoulder Barrier Transition (CSBT) is required per Structural Design Manual, Article 11.6, 35 length. Standard Drawing C4. Regrading of the bridge cone is not a feasible alternative. 56 Concrete Shoulder Barrier Transition 57 Transverse Slopes at Existing Bridge Cones Within the clear zone, the maximum unshielded transverse slope allowed to face traffic shall be 1:10 (V:H) and the maximum transverse slope facing away from approaching traffic shall be 1:4 (V:H). 58 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset 59 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope 60 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone 61 g. Clear Zone Select highest value in range Table 3-1 Clear Zone Distances in Feet from EOTW 62 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment 63 h. Clear Zone Adjustment 64 Level 2 Example- Location 17 Adjusted Clear Zone = 32 x 1.2 = 38.4 65 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern 66 i. Lateral Extent of the Area of Concern L2L2 Figure Approach Barrier Layout Variables LALA 67 Level 2 Example- Location 17 Lateral Extent of the Area of Concern L A = L c = 38.4 68 Lateral Extent of the Area of Concern L A =38.4 EOTW 69 Each AOC should be analyzed separately a. Establish EOTW b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 70 Flowchart for Analysis of Existing Obstacles (Figure 5.5a) 71 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speed c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 72 k. Lateral Offset of Barrier L2L2 Figure Approach Barrier Layout Variables L2L2 73 Level 2 Example- Location 17 L A = 38.4 L 2 = L 2 = 12.0 (11 + 1) 74 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADT d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 75 Level 2 Example- Location 17 L A = 38.4 Lateral Offset of Barrier L 2 = 12.0 (11 + 1) Y = Y = L Y = 12.0 Y = 12.69 76 l. Upstream End of Guardrail < L R LALA L2L2 Y X Figure Example of Barrier Design for Fixed Object on Horizontal Curve Graphical Determination of X 77 Level 2 Example- Location 17 L A = 38.4 L 2 = 12.0 (11 + 1) Y= Y = L Y = 12.0 = 12.69 Areas of Concern Crash Wall Upstream Station = CW Station CW Station = ( ) 78 Level 2 Example- Location 17 L A = 38.4 L 2 = 12.0 (11 + 1) Y= Y = L Y = 12.0 = 12.69 Areas of Concern Crash Wall Upstream Station = CW Station CW Station = ( ) Embankment Cone (EC) Upstream Station = EC US EC US = ( ) Embankment Cone (EC) Downstream Station = EC DS EC DS = ( ) 79 Level 2 Example- Location 17 L A = 38.4 L 2 = 12.0 (11 + 1) Y= Y = L Y = 12.0 = 12.69 Areas of Concern Crash Wall Upstream Station = CW Station CW Station = ( ) Embankment Cone (EC) Upstream Station = EC US EC US = ( ) Embankment Cone (EC) Downstream Station = EC DS EC DS = ( ) Length of EC = EC DS - EC US = ( ) - ( ) EC = 34.87 L AOC = Length of AOC = EC L AOC = 34.87 80 Area of Concern-Embankment Cone Upstream and Downstream limits L A =38.4 EOTW EC US = ( ) EC DS = ( ) 81 Level 2 Example- Location 17 Length of Need Graphical Solution Tangent Runout Path from EC = Tangent Runout Path = > L R = 300.0 Therefore, use L R to determine upstream end of the runout path X = Calculated Graphically X= 82 Level 2 Example- Location 17 Point of Need = PON Point of Need= PON= EC US X PON= ( ) PON = ( ) 83 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Length e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 84 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offset f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 85 Level 2 Example- Location 17 Length of Need = LON Length of Need = LON = X + L AOC LON = LON = 86 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslope g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 87 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zone h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 88 Level 2 Example- Location 17 Barrier Limits Determination Concrete Shoulder Barrier Transition = CBST CSBT = 35 CSBT Station = CW Station - CSBT = ( ) 35 CSBT Station = ( ) Lengths of Crash Wall (EC DS - CW Station ) and CSBT also contribute to Length of Need Length of Crash Wall = CW = EC DS - CW Station CW = ( ) ( ) CW = 17.73 Length of Guardrail = L Guardrail = LON - CW - CSBT - T6B - T1 L Guardrail = - 35 L Guardrail = 71.69 L Guardrail, R = L Guardrail (Round up to the nearest 12.5 increment) L Guardrail, R = 75.0 89 Level 2 Example- Location 17 Terminals Terminal = Type T6B T6B = 58.15 (43.15 counts toward length of need) Terminal = Type T1 (Special) T1 = 46.88 (34.38 counts toward length of need) 90 Level 2 Example- Location 17 T6B End_Station = CSBT Station + 15 T6B End_Station = ( ) + 15 T6B End_Station = ( ) T6B Begin_Station = CSBT Station 43.15 T6B Begin_Station = ( ) 43.15 T6B Begin_Station = ( ) GR End_Station = T6B Begin_Station GR End_Station = ( ) GR Begin_Station = GR End_Station L Guardrail,R GR Begin_Station = ( ) 75.0 GR Begin_Station = ( ) T1 Begin_Station = GR Begin_Station 46.88 T1 Begin_Station = ( ) 46.88 T1 Begin_Station = ( ) 91 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zoneq. Barrier Limits Check h. Clear Zone Adjustment i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 92 Barrier Limits Check: 12.5 < |PON T1 Begin_Station |< 25 12.5 < |( ) ( )| < 25 12.5 < 15.81 < 25 93 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zoneq. Barrier Limits Check h. Clear Zone Adjustmentr. Barrier Obstacle i. Lateral Extent of the Area of Concern j. Warrant Analysis Level 94 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zoneq. Barrier Limits Check h. Clear Zone Adjustmentr. Barrier Obstacle i. Lateral Extent of the Area of Concerns. Compare Existing Length to Proposed j. Warrant Analysis Level 95 Compare Existing Length to Proposed Compare Existing Guardrail Length to Proposed: Existing (with terminals): Proposed (with terminals): Proposed length of guardrail is less than the existing length due to both the shorter L R length in the current AASHTO Roadside Design Guide (2011), Table 5-10b, and the addition of 35 of Concrete Shoulder Barrier Transition. 96 Each AOC should be analyzed separately a. Establish EOTWk. Lateral Offset of Barrier b. Design Speedl. Upstream End of Guardrail c. Design ADTm. Downstream End of Barrier d. Runout Lengthn. Length of Need e. Shy Line Offseto. Upstream End of Concrete Barrier f. Foreslope / Backslopep. Barrier Limits Determination g. Clear Zoneq. Barrier Limits Check h. Clear Zone Adjustmentr. Barrier Obstacle i. Lateral Extent of the Area of Concerns. Compare Existing Length to Proposed j. Warrant Analysis Levelt. Prepare Warrant Text and Exhibits 97 Level 2 Example- Location 17 Site Plan 98 Questions? 99 Acceleration Example-Speed Profile 100 Site Plan 101 Acceleration Table Table 10-3 Minimum Acceleration Lengths for Entrance Terminals with Flat Grades of Two Percent or Less 102 Example-Speed Profile-Site Plan 30 MPH 40 MPH 50 MPH 60 MPH 70 MPH 103 Deceleration Example-Speed Profile 104 Deceleration Example-Speed Profile 105 Deceleration Example-Speed Profile 106 Deceleration Example-Speed Profile MPH 60 MPH 50 MPH 40 MPH RSAP Guidance 108 RSAP Guidance (General) 109 Considers: Initial Construction Costs Maintenance Costs Predicts Crash Costs Compares 2 or more alternatives RSAP Guidance (General) 110 Simulates one encroachment at a time using randomly generated conditions. Encroachment frequency generally increases as the ADT increases. RSAP Guidance (Benefit /Cost Analysis) B Crash $s C Direct $s 111 = RSAP Vehicle Encroachment 112 Median Slope Feature 1 Slope Feature 3 Slope Feature 2 Rigid Object Feature Vehicle Types 49 Combinations of V 0 and 0 Vehicle Path: Straight and No braking V0V0 Shoulder RSAP Guidance (Roadway Segments) Split based on: Vertical Grade (if downgrade > 2%) Horizontal Curve (if R < 1910) 113 RSAP Guidance (Crash Costs) K Fatal $ 5,000,000 A $ 500,000 B Injury $ 100,000 C $ 30,000 O PDO $ 6,000 Note that these $s are different than the default values and need to be input by the user. 114 (Property damage only) RSAP Guidance (Features) Category Type Foreslope54 Backslope25 Intersecting Slope90 Fixed Object34 Culvert End35 Longitudinal Barrier17 Terminal & Crash Cushion11 115 Level 3 Example 116 Overhead Sign Structure Span Type Level 3 Example Plan 117 Flowchart for Analysis of Proposed Obstacles (Figure 5.5b) 118 New Overhead Sign Truss, Article Designer shall perform a Level 3 Analysis to determine the most cost-effective design for all new overhead sign installations. Alternatives at minimum to evaluate shall include: (1) base condition shortest span or arm with shielding. (2) span or arm length which places foundation outside defined clear zone with no shielding or if clear zone is undefined places foundation such that the criteria in Table is met. (3) longer span or arm which places foundation well outside the clear zone with no shielding. 119 Level 3 Example-Sign Structure Alternatives for Foundation Alternative 1 (Base Condition) 95' span length Foundation within clear zone and shielded Alternative 2 105' span length Foundation just outside clear zone and unshielded Alternative 3 115' span length Foundation well outside clear zone and unshielded Because all three alternatives are feasible, a level 3 analysis will be performed. Sign Structure Foundation Details 121 Foundation 3.5 x 18.0 Level 3 Example Feature Sketch-Alt Level 3 Example Feature Sketch-Alt Level 3 Example Feature Sketch-Alt Level 3 Example Feature Sketch-Alt Level 3 Example Feature Sketch-Alt Level 3 Example Feature Sketch-Alt Level 3 Example Guardrail Calculation 128 TOLLWAY PROJECT NO. RR-XX-XXXX Roadway Reconstruction Tollway M.P. 200 to M.P. 205 Barrier Warrant Analysis DATA SHEET Area of Concern:E074 DESCRIPTION OF OBSTACLE Sign truss foundation (AOC E074) at Sta The foundation is 18.0' long (parallel to traffic) by 3.5' wide. The full 18' length of foundation is considered an obstacle. This analysis is to determine the shielding required for Alternative #1. DESIGN CONCEPTS Design Speed =70 MPH (Mainline design speed) ADT =74,759 (2013 Tollway Traffic Data Report, pg. A-14) Clear Zone (L C ) = 30 based on 1:6 backslope (Table 3-1 AASHTO Roadside Design Guide 2011) Tangent section; no horizontal curve adjustments necessary. Runout length (L R ) = 360 ft. (from Table 5-10b AASHTO Roadside Design Guide 2011) Stationing increases going downstream. Level 3 Example Guardrail Calculation 129 Area of Concern E074 Sign Truss Foundation Alternative 1 L 3 = 25.75 L A = L = 29.25 L 2 = 15 + 1 = 18.23 L R = 360.0 Y = L Y = 18.92 Level 3 Example Guardrail Calculation 130 Area of Concern (AOC) USF Sign Truss Fndn_Upstream_Station = USF USF = L AOC = Length of AOC = 18.0' DSF Sign Truss Fndn_Downstream_Station = DSF DSF = Length of Need - Formula X = (L A Y) / (L A / L R ) = (29.25 18.92) / (29.25 / 360) = X = ' Point of Need = PON = USF X PON = ' PON = Level 3 Example Guardrail Calculation 131 Downstream Condition: Offset: back of guardrail to face of foundation = 5.76' Therefore, Condition 1 applies (See TBG Figure 5.12) Overlap Distance = OL = 10.0' Length of Need = LON = X + L AOC + OL LON = ' ' ' = ' Level 3 Example Guardrail Calculation 132 Proposed Guardrail Terminals Downstream End Terminal = Type T2 T2 = 12.5' (0' counts toward length of need) Upstream End Terminal = Type T1 (Special) T1 = 46.88' (34.38' counts toward length of need) Level 3 Example Guardrail Calculation 133 Barrier Limits Determination Length of Guardrail = L Guardrail = LON T1 (LON contribution) L Guardrail = ' ' L Guardrail = ' L Guardrail, R = L Guardrail (Round up to nearest 12.5' increment) L Guardrail, R = 125.0' Minimum length check: Okay T2 End_Station = DSF + OL + T2 T2 End_Station = ' ' T2 End_Station = ( ) GR End_Station = T2 Begin_Station = T2 End_Station T2 GR End_Station = ' GR End_Station = ( ) Level 3 Example Guardrail Calculation 134 GR Begin_Station = GR End_Station L Guardrail,R GR Begin_Station = ' GR Begin_Station = ( ) T1 Begin_Station = GR Begin_Station T1 T1 Begin_Station = ' T1 Begin_Station = ( ) Recovery Area Check: There are no objects within the recovery area. Barrier Limits Check: 12.5 < PON T1 Begin_Station < 25 12.5 < ( ) - ( ) < 25' 12.5 OK Existing Guardrail v. Proposed condition (including terminals) No existing guardrail Recommendation: Install guardrail and terminals to stations listed above, pending results of Level 3 analysis. Level 3 Example Plan 135 Level 3 Example Estimated Costs 136 Cost Tab 137 Highway Tab 138 Segments Tab 139 Features Tab 140 Highway Tab-View Pulldown 141 View/ Crash Cost 142 View/ Crash Cost/ KABCO 143 Options/ Units 144 Option/ Edit Feature 145 Option/ Edit Feature 146 UPDATE Edit Feature 147 Features/ Category 148 Features / Category/ User Defined 149 Feature/ Types 150 RSAP Output 151 RSAP Output 152 RSAP Output 153 RSAP Output 154 RSAP Output 155 RSAP Output 156 RSAP Output vs. 1 2 is better 2 vs. 3 3 is better Select Alternative #3 Recommendation: Install 115' sign truss span. Do not shield sign foundation. Benefit/Cost Ratio Report - Sample #1 File Name: Sample RSAP Project #1 Project Description: Sample RSAP Project #1 AlternativeDescription 1Base condition. Minimum length of guardrail shielding sign truss foundation. 2Unshielded sign foundation just outside the clear zone. 3Unshielded sign foundation well outside the clear zone. Alternative Pair-Wise Comparison There is no pair-wise comparison that exceeds the threshold value of 1.5. Therefore, there is no alternative that is superior to the base condition. Select Alternative #1. 158 Benefit/Cost Ratio Report - Sample #2 File Name: Sample RSAP Project #2 Project Description: Sample RSAP Project #2 AlternativeDescription 1Base condition. Minimum length of guardrail shielding sign truss foundation. 2Unshielded sign foundation just outside the clear zone. 3Unshielded sign foundation well outside the clear zone. Alternative Pair-Wise Comparison 1) Alt. 1 vs. Alt. 2 has a positive B/C ratio (25.11), greater than 1.5. Alt. 2 is better. 3) Alt. 2 vs. Alt. 3 has a positive B/C ratio (1.07), but is less than 1.5. Alt. 2 is better. Select Alternative #2. Note that you do not compare the numbers and in the first row to each other. Alts 2 & 3 are compared directly in the second row. 159 Benefit/Cost Ratio Report - Sample #3 File Name: Sample RSAP Project #3 Project Description: Sample RSAP Project #3 AlternativeDescription 1Base condition. Minimum length of guardrail shielding sign truss foundation. 2Unshielded sign foundation just outside the clear zone. 3Unshielded sign foundation 10' outside the clear zone. 4Unshielded sign foundation 20' outside the clear zone. Alternative Pair-Wise Comparison 1) Alt. 1 vs. Alt. 2 has a positive B/C ratio (2.17). Alt. 2 is better. 2) Alt. 2 vs. Alt. 3 has a positive B/C ratio (4.23), greater than 1.5. Alt. 3 is better. 3) Alt. 3 vs. Alt. 4 has a positive B/C ratio (1.10), but is less than 1.5. Alt. 3 is better. Select Alternative #3. 160 Questions? 161 Contact Information: Ext Ext