Inductive pattern recognition
Inductive loops have for decades been used for vehicle monitoring. The technique is well known and well proven. Mostly it is used for vehicle counting, but also for monitoring speed and length.
It is also well known that signals from inductive loops comprise more information than what is needed for calculating vehicle speed and vehicle length. Different vehicles can give distinct signal signatures.
Over the last few years the requests for recognizing single vehicles and sequences of vehicles has increased. So has the need for more accurate speed and length calculations.