M4 is blocked northbound due to a road traffic collision.
Routes Affected: A10,SL9
A10 - From Heathrow Vehicle Tunnel at East Ramp, Use East Ramp, Ah Sipson Road and LOR from Cherry Lane Roundabout.
SL9 - From Tunnel Road West at West Ramp, L West Ramp, L Newman Road, R Northern Perimeter Road (West), R Newport Road, L Newport Road, R Bath Road LOR
Diversion Reference D72161