Spectre
The Deported
- Joined
- Feb 1, 2007
- Messages
- 36,832
- Location
- Dallas, Texas
- Car(s)
- 00 4Runner | 02 919 | 87 XJ6 | 86 CB700SC
With an automatic transmission, if you have the thing in Drive, you must apply the brakes to keep the vehicle from moving forward. After a while at the light, your natural tendency is to slack off the brake pedal a bit, which means the car will creep forward.
Many lights in the US are placed at the intersection of a busy street and a less travelled one. To run the thing on raw timers would be stupid if there isn't much cross traffic, so the traffic light relies on magnetic sensors placed in the road bed to tell it when there's a vehicle there. The sensor reports the presence of a vehicle, the light's computer goes into "change light mode", and depending on how many vehicles are waiting for the light (as reported by multiple sensors in each lane), it changes and holds the light for the crosstraffic, then changes the light back to let the busy street flow again until another car arrives at the cross street.
Many lights in the US are placed at the intersection of a busy street and a less travelled one. To run the thing on raw timers would be stupid if there isn't much cross traffic, so the traffic light relies on magnetic sensors placed in the road bed to tell it when there's a vehicle there. The sensor reports the presence of a vehicle, the light's computer goes into "change light mode", and depending on how many vehicles are waiting for the light (as reported by multiple sensors in each lane), it changes and holds the light for the crosstraffic, then changes the light back to let the busy street flow again until another car arrives at the cross street.