Early smart motorways used the hard shoulder only at peak times but new schemes have no breakdown lane at all.

The bridge has no significant shoulder (breakdown lane) and no pedestrian walkway.

While the bridge had a southbound breakdown lane, it did not prevent severe disruption to northbound traffic caused by breakdowns in that direction.

Widening occurred in 1959 for a breakdown lane.

All carriageways were widened by utilizing the breakdown lane space, and remarking the existing lanes.