Abstract
A study was conducted to explore the determinants of gap-acceptance by bicyclists, intersecting an artery with two-way traffic. Video recordings were available for two types of left-turn manoeuvres, one from the cycle-track along the main road and one from a minor street; two different lay-outs of the main road were studied, one with traffic-lanes of 2 x 4.6m (before-period) and one with 2 x 3.6m with a free area of two metres in the middle of the road with a refuge (after-period). About one half of the crossings results in an accepted gap or lag.