vehicle traffic is the number of vehicles travelling on road.
Yes, a bicycle is considered a vehicle according to traffic laws.
Secure your vehicle.
The vehicle exiting the parking space that did not yield to oncoming traffic.
oncoming traffic
No, royal mail vehicles are required to obey traffic laws just like any other vehicle. Passing through a red traffic light is illegal and dangerous, regardless of the type of vehicle.
It indicates a slow moving vehicle, which would be operating below normal traffic speed.
Actually, you got it backwards. The vehicle which is already in the traffic flow has right-of-way, and the vehicle entering is the give-way vehicle. If you're able to move over to allow them it, it would be nice, but you shouldn't disrupt the traffic flow in order to do this.
has this vehicle been involved in any traffic accidents
When you yield the right of way to another vehicle, you are demonstrating courtesy and following the rules of the road in the traffic situation.
The National Traffic and Motor Vehicle Safety Act
what is 1203C
In the US, we call them "Traffic Circles".