Cyclists need to stop at junctions, and the stop lines need to be further back than the ones for motor vehicles so that the cyclist can see before proceeding. Ideally the cyclist needs to vacate the corner and actively cross a side road instead of passing it. The idea that a cyclist would just carry on along a straight cycle lane at a junction (intersection, whatever), or stopping within the turning area of a trailer, is a recipe for getting swiped like that female doctor cyclist did the other year.