Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March...
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Transcript of Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March...
![Page 1: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/1.jpg)
Lane Width ReallocationsBased on 5-Year Crash Data
Richard C. Moeur, PE
ADOT Traffic DesignMarch 2007 edition
![Page 2: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/2.jpg)
Flagstaff
• Business Route 40 is primary east-west arterial street in Flagstaff
• Also known as “Route 66”• Was US 66 from 1920s-1980s• Currently signed as Historic US 66
• Currently owned & managed by ADOT• Will transfer to City of Flagstaff in future
![Page 3: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/3.jpg)
Crash Analysis
• Part of design exception analysis for two B-40 paving projects in Flagstaff
• Looked at all reported crashes from MP 195 - 200• Jan 00 - Dec 04 (5 years)
• Bike-MV crashes make up nearly 25% of all reported crashes in corridor• (75 out of 300+ total crashes)
![Page 4: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/4.jpg)
Bike-MV Crashes By Type
![Page 5: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/5.jpg)
Bike-MV Crash Severity
![Page 6: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/6.jpg)
Findings
• 60% of bicycle-motor vehicle crashes involved wrong-way bicyclists• 50% of crashes involved wrong-way
sidewalk or path riding
• 63% of bike-MV crashes involved sidewalk or path bicyclists
• 34% on north sidewalk BNSF OP - E Flg• 10% on south side path downtown - E Flg• 19% on other sidewalks (Milton, W 66)
![Page 7: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/7.jpg)
Findings
• Only 1 crash involved an overtaking motorist colliding with a cyclist traveling in the roadway
• Motorist cited for 28-735
• Only 1 fatal crash• at B-40 onramp at East Flag TI
• Bicyclist at fault in 72% of crashes• Only 15% resulting in citation
![Page 8: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/8.jpg)
Hot Spots
• 6 bicycle-MV crashes at Milton / B-40• 83% wrong way riding on sidewalk
• 6 bicycle-MV crashes at US 180 / B-40• 83% sidewalk riding
• 8 bicycle-MV crashes at Enterprise / B-40• 100% non-roadway cyclists
• 62% involving pathway users (south side)
• 75% involved wrong way riding
![Page 9: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/9.jpg)
Critical Issues
• Wrong-way riding• Bicyclist approaches conflict points from
unseen and unexpected direction
• Sidewalk / path operation• Perceived as safer, but has higher crash risk• Bicyclists enter intersections unexpectedly
![Page 10: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/10.jpg)
Sidewalk/Path Conflicts -Left Turn From Parallel Road
![Page 11: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/11.jpg)
Sidewalk/Path Conflicts -Left Turn From Cross Road
![Page 12: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/12.jpg)
Sidewalk/Path Conflicts -Right Turn From Cross Road
![Page 13: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/13.jpg)
Critical Issues
• Low apparent percentage of bicyclists riding in roadway• Outside lane widths not sharable per 28-815
• Drivers must change lanes to pass• Bicyclists may be uncomfortable occupying lane• Relatively high traffic volumes
• Speeds consistent with urban arterial• apx. 40 MPH through much of corridor
![Page 14: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/14.jpg)
Lane Widths
• AASHTO Green Book & ADOT Roadway Design Guide allow wide variety of lane widths
• 12 ft is ‘basic’ width• But is “worst-case” situation for sharing• Looks sharable, but really isn’t
• 10’ - 11’ are fully endorsed by AASHTO• 14’ is minimum sharable width
• ARS 28-735 requires 3 ft passing distance for bicyclists
![Page 15: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/15.jpg)
Recommendations
• Discourage wrong-way riding
• Encourage on-street riding
![Page 16: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/16.jpg)
Recommendations
• 60 ft roadway• (plus 2’ curb & gutter each side)
• Old lane widths• 2 x 12’ lanes each direction + 12’ TWLTL
• Revised lane widths• 10’ TWLTL• 11’ inside travel lanes• 14’ sharable outside travel lanes
![Page 17: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/17.jpg)
Existing Lane Configuration
![Page 18: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/18.jpg)
Recommended Lane Width Adjustments
![Page 19: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/19.jpg)
ADOT Bike Policy
• ADOT will allow bike lanes or other facilities on state highways
• However, ADOT requires local agency responsibility for bike-specific signs & markings
• No agreement reached on B-40 (yet…?)
![Page 20: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/20.jpg)
Possible Bike Lane or Shoulder Configuration
![Page 21: Lane Width Reallocations Based on 5-Year Crash Data Richard C. Moeur, PE ADOT Traffic Design March 2007 edition.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649cf75503460f949c676d/html5/thumbnails/21.jpg)
Questions?
• Presentation can be downloaded from:
• http://www.richardcmoeur.com/pres/b40flag.ppt