Ian wrote in
:

If you have
difficulty stopping at the correct line you shouldn't be driving.

In my experience, in wet weather (when the road is shiny) or at night, it's
very hard to see that there's a cycle box from a distance so you plan your
braking based on the assumption that the stop line is level with the traffic
light pole. Then as you get closer, you suddenly discover that you need to
stop further back that you'd anticipated.

The solution to this is to move the traffic light poles back so they are
level with the car stop line.