01764298

Component

https://annualmeeting.myt...nlineProgram/Details/15916

Motorized traffic exposure and delay are two critical factors for bicycle level of service (LOS). Unfortunately, the current Highway Capacity Manual’s methodology for bicycle LOS fully accounts for neither. At the intersection level, motorized traffic speed and bicycle delay are not considered at all; and at the link level there is no account for one of the most effective traffic-exposure mitigating infrastructure types, separated bicycle lanes. This creates a systemic problem, enabling the design of roadways that ignore bicycle exposure and delay (i.e., comfort and safety), while giving approving LOS grades to otherwise poor roads and intersections. This paper presents several proposed revisions to the existing Highway Capacity Manuals methodology for bicycle LOS. The proposed revisions include methodologies to account for separated bicycle lane buffers along links, estimated bicycle delay from right-turning motorists, estimated bicycle delay when performing one- and two-stage left turns, and the motorized traffic speed exposure of bicycles at intersection. The proposed revisions are largely comprised existing methodologies (e.g., pedestrian delay at two-way stop-controlled intersections) and classical analytical approaches that fall seamlessly into the existing Highway Capacity Manual’s formulaic approach.

This paper was sponsored by TRB committee ACH20 Standing Committee on Bicycle Transportation.

TRBAM-21-00593

English

22p

2021

Transportation Research Board 100th Annual Meeting

Digital/other

Figures; References; Tables

Bicycle lanes; Bicycling; Crash exposure; Left turns; Level of service; Methodology; Traffic delays; Traffic safety; Traffic speed

Highway Capacity Manual

Highways; Operations and Traffic Management; Pedestrians and Bicyclists; Safety and Human Factors

Transportation Research Board Annual Meeting 2021 Paper #TRBAM-21-00593

TRIS, TRB, ATRI

Dec 23 2020 11:24AM