If you park your car, you must...

Before leaving the driving seat you must: stop the engine and switch off the ignition system; apply the parking brake; if stopping on a slope, you must: engage the appropriate gear — first gear on an uphill slope and reverse gear on a downhill slope, or the park position where applicable. Vehicle combinations, buses, and vehicles with a GVW of more than 3,500 kg must be properly chocked: by resting one of the steering wheels against the kerb, turning them towards the centre of the road on uphill slopes and outward on downhill slopes, or by placing suitable chocks, without using stones or other items not intended for that purpose. The chocks must be removed before setting off.