Final answer:
To maintain safety when approaching a vehicle parked at the curb, one should approach the driver's door facing traffic to observe oncoming vehicles and cyclists.
Step-by-step explanation:
When approaching your vehicle that is parked at the curb, you should approach the driver's door facing traffic. This way, you can see oncoming vehicles and cyclists, increasing safety for yourself and others on the road. It is the best practice to be aware of your surroundings and avoid turning your back to traffic.