Bicycle Level of Service: Accounting for Protected Lanes, Traffic Exposure, and Delay

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.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 22p

Subject/Index Terms

Filing Info

  • Accession Number: 01764298
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-00593
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:24AM