M4 bus lane (original) (raw)

The M4 bus lane was a 3.5-mile (5.6 km) bus lane on the eastbound (London-bound) carriageway of the M4 motorway between Heathrow Airport and central London. It operated between junction 3 (A312) to the start of the elevated 2-lane section near Brentford. The lane, which had no intermediate junctions, was reserved for buses, coaches, motorbikes, emergency vehicles and licensed taxis but not mini-cabs. It was positioned in Lane 3 on the motorway, causing bus drivers to switch lanes between 1 mile and 500 yards before the lane started.