Segregated Cycle Lanes
Segregated cycle lanes within the carriageway can provide a safe and comfortable environment for cyclists without taking space from pedestrians, and avoiding the discontinuity and loss of priority at side roads and vehicle accesses that can be a disadvantage with fully off-road cycle tracks.
However, a risk of such an arrangement is that, at side-roads, because left-turning vehicles have to turn across the cycle lane, they may come into conflict with cyclists moving straight ahead. Physical segregation can also make it more difficult for cyclists to turn right.
Transport for London (TfL) has therefore asked TRL to develop a number of trials to investigate different aspects of the design of segregated cycle lanes, in particular at junctions. These include:
- How far before a junction should physical segregation within the carriageway end
- What road markings should be used to continue cycle lanes past a side-road turning
- Different methods for separating cycle lanes from other traffic, which can range from continuous segregation by kerbs and hard margins; intermittent separation with bollards and reflective markers, to lines only
In an associated trial, TRL is looking at different types of segregated lane separators, including Jislon Wands (previously used on the Olympic lanes) and Zicla Zebra 9 units, sometimes known as Armadillos, (an 820mm long Spanish product made from 100% recycled PVC), and kerbs with a hard margin.