3 ms·
Doesn't work at the airports where the ticket machine only gives tickets when there's weight of the car on the sensors beneath the roadway.
by aeontech 16y ago
Doesn't work at the airports where the ticket machine only gives tickets when there's weight of the car on the sensors beneath the roadway.
- viggity 16y agoactually, they don't use weight, the sensors they use are inductive coils - so if you take a strong neodymium magnet and wave it above the coil it should hopefully trip it http://www.wikihow.com/Trigger-Green-Traffic-Lights http://www.wikihow.com/Trigger-Green-Traffic-Lights
- aeontech 16y agoInteresting, I had no idea. I did wonder how much trouble it would be to place sensors under the roadway; this makes for a much more elegant solution.