Before a responder goes out on a call the vehicle should be inspected to minimise the risk of accidents and failure.
P - Petrol
check that there is sufficient fuel in the vehicle
O - Oil
check all fluids including engine oil, brake fluid, steering fluid.
W - Water
check both coolant and the windscreen wash; in muddy conditions being able to wash/wipe the windows is vital for safe driving.
D - Damage
check for loose bits that may fall off, damaged components that might fail, get under and check joints and bushes, check light lenses etc.
E - Electrics
check that all the electrics work including the wipers, lights, horn and screen wash
R - Rubber
check the tyres for tread depth (minimum 1.6mm) inflation, cuts, and abrasion; check the wiper rubbers