PC Ed Clarke responds to a 999 call from a worried driver who is behind a van on the M6 that is all over the road and has nearly collided with the central reservation. When Ed gets eyes on the vehicle, the dangerous driving is clear to see and a breathalyser test at twice the drink drive limit explains everything. On the night shift, PCs Kara Pilarczyk and Tom Cordall pull over a delivery driver for not wearing his seatbelt, but the man's evasive behaviour raises suspicions.