Southeast of the Brockley Hill roundabout the A41 cycle route crosses the slip road that takes A41 traffic onto the M1. The speed limit is 70 mph. There are yellow cross-lines on the main A41 carriageway to slow traffic approaching the roundabout. However, there are no cross-lines on the two-lane slip road and traffic is accelerating to merge with the M1 motorway traffic.

The at grade cycle crossing point, over a hard shoulder and two traffic lanes, is unmarked on the road and there are no ‘Cyclists Crossing’ warning signs approaching it.

There was a cyclist injury in 2009 and a cyclist fatality in 2010.