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CE 355: Principles of Transportation

EngineeringF2F Lecture 10

Recap of LOS

Section 9.1–9.2, pg. 447-472Problems: 9-5, 9-8, 9-9, 9-11

Course Learning Objectives After today’s lecture, students should be able

to: Identify appropriate service measures for

freeways and multilane highways. Conduct capacity/level-of-service analyses for

freeways and multilane highways. Describe conditions that affect the level-of-service

for freeways and multilane highways.

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Freeway LOS

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Freeway Segments:Base Conditions Minimum lane width Minimum right-shoulder

clearance between edge of travel lane and objects

Minimum median lateral clearance

Vehicle type in traffic stream Lanes in each direction Interchange spacing Terrain Driver population

12 ft 6 ft

2 ft

Only passenger cars

5 or more 2 mi or greater Level (no grades over 2%) Mostly familiar users

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Multilane LOS

AMLCLW ffffBFFSFFS

Multilane Highways:HCM Base Conditions Minimum lane width Total lateral clearance Vehicle type Access point spacing Separation of traffic Terrain Driver population Free-flow speed

12 ft 12 ft Only passenger cars No direct access points Divided Highway Level (no grades over 2%) Mostly familiar users 60 mph or more

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In-Class Assignment:LOS Analysis of I-35 Students shall

conduct an LOS analysis for the section of I-35 southbound from US-30 to Highway 210.

Wrapping Up Next Lecture:

Two-Lane Highway LOS Reading: GH Section 9.3 (pp. 472-493)

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