Plot: After receiving reports that a lorry driver has almost struck a road worker on the M1, officers race to intercept a seven-and-a-half-ton truck, with Sgt Scott Riley deploying a stinger to bring the vehicle to a standstill. PC Chris Ryan receives a police camera alert that the driver in the car in front of him may under the influence of drugs, while Sgt Steve Hughes and his team investigate a crash in which a car hit a wall