Study Details

Study Title: Bicycle Tracks and Lanes: a Before-After Study

Authors: Jensen

Publication Date: JAN, 2008

Abstract: This paper presents a before-after crash, injury and traffic study of constructing bicycle tracks and marking bicycle lanes in Copenhagen, Denmark. Corrections factors for changes in traffic volumes and crash / injury trends are included using a general comparison group in this non-experimental observational study. Analysis of long-term crash trends points towards no significant abnormal crash counts in the before period. The safety effects of bicycle tracks in urban areas are an increase of about 10 percent in both crashes and injuries. The safety effects of bicycle lanes in urban areas are an increase of 5 percent in crashes and 15 percent in injuries. Bicyclists' safety has worsened on roads, where bicycle facilities have been implemented. Design of bicycle facilities and parking conditions for motor vehicles clearly seems to have safety implications, especially at intersections. The study has revealed a few points in relation to this. Construction of bicycle tracks resulted in a 20 percent increase in bicycle / moped traffic mileage and a decrease of 10 percent in motor vehicle traffic mileage, whereas marking of bicycle lanes resulted in a 5 percent increase in bicycle / moped traffic mileage and a decrease of 1 percent in motor vehicle traffic mileage. The changes in traffic do result in health benefits due to more physical activity, less air pollution and less traffic noise. The positive benefits may well be much higher than the negative consequences caused by new safety problems.

Study Citation: Jensen, S.U. "Bicycle Tracks and Lanes: a Before-After Study." TRB 87th Annual Meeting Compendium of Papers CD-ROM. Washington, D.C., (2008).

Study Report: Download the Study Report Document


CMFs Associated With This Study

Category: Bicyclists

Countermeasure: Install bicycle lanes

CMF CRF(%) Quality Crash Type Crash Severity Roadway Type Area Type
1.05 -5 1 Star All All Not Specified Urban
1.14 -14 1 Star All K,A,B,C Not Specified Urban
1.01 -1 1 Star All O Not Specified Urban
0.83 17 1 Star Vehicle/pedestrian K,A,B,C Not Specified Urban
0.92 8 1 Star Vehicle/pedestrian K,A,B,C Not Specified Urban
0.47 53 1 Star Vehicle/pedestrian K,A,B,C Not Specified Urban
1.49 -49 1 Star Vehicle/bicycle K,A,B,C Not Specified Urban
1.57 -57 1 Star Vehicle/bicycle K,A,B,C Not Specified Urban

Countermeasure: Install bicycle tracks

CMF CRF(%) Quality Crash Type Crash Severity Roadway Type Area Type
1.12 -12 2 Stars All K,A,B,C Not Specified
1.06 -6 1 Star All O Not Specified
1.18 -18 2 Stars All All Not Specified
0.9 10 1 Star All All Not Specified
0.97 3 1 Star Single vehicle All Not Specified
0.92 8 1 Star Single vehicle All Not Specified
1.16 -16 1 Star Single vehicle All Not Specified Not specified
0.93 7 1 Star Rear end All Not Specified
1.01 -1 1 Star Rear end All Not Specified
0.37 63 2 Stars Vehicle/bicycle All Not Specified Not specified
2.2 -120 2 Stars Not specified All Not Specified
1.34 -34 1 Star Head on All Not Specified
2.4 -140 2 Stars All All Not Specified
1.7 -70 2 Stars All All Not Specified
2.29 -129 2 Stars Vehicle/bicycle All Not Specified
1.77 -77 1 Star Vehicle/pedestrian All Not Specified
2.35 -135 1 Star All All Not Specified
1.12 -12 2 Stars All All Not Specified
1.09 -9 1 Star All All Not Specified
1.48 -48 2 Stars Vehicle/bicycle All Not Specified
1.01 -1 1 Star Vehicle/pedestrian All Not Specified
0.59 41 2 Stars All All Not Specified
0.99 1 1 Star Angle All Not Specified
0.79 21 2 Stars Fixed object All Not Specified
0.92 8 1 Star Fixed object All Not Specified
0.62 38 2 Stars Fixed object,Vehicle/pedestrian All Not Specified
1.13 -13 1 Star Vehicle/pedestrian All Not Specified
0.9 10 2 Stars Vehicle/pedestrian All Not Specified Not specified
1.8 -80 2 Stars All All Not Specified
1.23 -23 1 Star All All Not Specified
1.05 -5 1 Star Vehicle/pedestrian All Not Specified
1.78 -78 1 Star All All Not Specified
6.19 -519 1 Star Vehicle/pedestrian All Not Specified All
1.66 -66 1 Star Vehicle/pedestrian All Not Specified
1 0 1 Star All All Not Specified Urban
1.3 -30 1 Star All All Not Specified Urban
1.19 -19 2 Stars Vehicle/pedestrian K,A,B,C Not Specified Urban
1.3 -30 2 Stars Vehicle/pedestrian K,A,B,C Not Specified Urban
1.07 -7 1 Star Vehicle/pedestrian K,A,B,C Not Specified Urban
1.1 -10 1 Star Vehicle/bicycle K,A,B,C Not Specified Urban
1.24 -24 2 Stars Vehicle/bicycle K,A,B,C Not Specified Urban
0.87 13 1 Star Vehicle/bicycle K,A,B,C Not Specified Urban
1.04 -4 1 Star All K,A,B,C Not Specified Urban
0.97 3 1 Star All K,A,B,C Not Specified Urban
1.27 -27 1 Star Vehicle/bicycle K,A,B,C Not Specified Urban
1.12 -12 1 Star All K,A,B,C Not Specified Urban
1.01 -1 1 Star All K,A,B,C Not Specified Urban
1.39 -39 1 Star All K,A,B,C Not Specified Urban