Two officers have been thanked after helped a man who had suffered a cardiac arrest at Keele Services.
PCs Sarah Gifford and Barry Joynson were at the services on the M6 for another incident, when they saw staff crouched around a man on the floor in the recovery position.
The officers performed CPR and were supported by staff with a defibrillator until ambulance staff arrived.
They then escorted the ambulance to the Royal Stoke University Hospital where they continued to help with CPR.
The man, a 49-year-old from Manchester, remains in hospital.
The duty manager at Keele Services contacted the officers to express his gratitude.