Research Papers

Reduced Bicycle / Auto Conflicts in Urban Roadworks

Version 1
Date added June 18, 2019
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Category 2019 CARSP XXIX Calgary
Tags Policy and Practice, Session 4A
Author/Auteur Cox
Stream/Volet Policy and Practice

Slidedeck Presentation Only:



Background/Context: A key problem for TFL - Transport for London - is how to reduce the 2000+ people killed or seriously injured annually while expanding the push towards more sustainable modes of travel. London has invested heavily in segregated pathways for bicycles to minimize conflicts with motorists.  Speed contributes to the seriousness of a crash. A pedestrian or cyclist has a 40% chance of surviving a crash when the speed is 30 MPH. That survival rate jumps up to 90% when the speed is 20 MPH.  Short-term roadworks can close the segregated bikeways which force the bicyclists to use the driving lane. Too many motorists are distracted by smart phone use and do not notice the signage indicating that the lane is shared by cyclists through the work zone.  TFL noted research reports from France, the US and Australia that speed compliance and increased driver awareness resulted from a scheme using additional signs and temporary rumble strips. This presentation will explain the scheme now in use by TFL.

Aims/Objectives: The objective of the traffic scheme was to minimize conflicts between cyclists and motorists when road works force the cyclists from the segregated pathway onto the driving lane. The scheme should make drivers aware of the change to a shared-use lane condition and should reduce actual speed.

Methods/Targets: The traffic scheme focuses on road users, especially bicycle safety advocates and neighborhood associations in the area of the work site to get their buy-in to the mixed-use lane treatment. In addition, designers and contractors are involved to ensure compliance to the scheme during the construction process.

Results/Activities: The first step in developing the scheme was to meet with industry partners to develop a prototype plan that included additional signage and portable, temporary rumble strips. The spacing of the elements was tested on live streets in conjunction with bicycle advocacy groups. The trials resulted in a typical installation pattern which is used as a baseline for future projects.

Each succeeding project began with a site visit to see what modifications to the typical pattern are required. The next step is to publish the traffic control plan. Meeting are arranged with local interested parties to explain the scheme to be used.

A monitoring schedule is agreed to by the contractor. The designated party then monitors the site as per the schedule.

Discussion/Deliverables: Using this scheme, speeds showed a 10% drop. From a report on the Wedge House development project, the reviewer noted: Observations showed that the majority of drivers [approx. 80%] reduced speed to negotiate the strips and, by the time they had regained speed, they were through the traffic management.