Here is the link to the Traffic Detector Handbook from the Federal Highway Administration: http://www.fhwa.dot.gov/publications/research/operations/its/06108/02.cfm This will explain more about vehicle detection using induction loops.
Here are a few resources:
So the question I have can be broken into parts:
- Can a magnet alone (imagine the bike is all plastic) trigger the vehicle detection?
- How strong a magnet do I need (dimensions, pull?)?
- Are dimensions / shape sufficient by themselves?
- Is the grade / pull force important at all for this application?
- Significant difference between ceramic, rare-earth, ... for this application?
- Let's say I can purchase a magnet, how should I position it on the bike?
There are many different stances on the topic, some calling the magnets just bogus and not working, some swearing by it. I have very little understanding of magnetic field & eddy currents and how a magnet could affect an induction loop, so verbose explanations would help.
I am trying to figure out if sticking a ferromagnetic magnet (rare-earth / neodymium) under a moving vehicle would help at all.
- it is ferromagnetic,
- it is a magnet,
- it moves with the vehicle,
- it is lower to the ground than where an engine would be.