What should the driver of the grey car (arrowed) be especially aware of?

Explanation: When passing parked cars, there's a risk that a driver or passenger may not check before opening the door into the road. A defensive driver will drive slowly and be looking for people who may be about to get out of their car.

Category: Hazard awareness

References: The Official DVSA Guide to Riding: Section 8, The Official DVSA Guide to Riding: Section 10, Highway Code: Rule 205-206