Does anynone know any (manufacturer) sensor to use counting vehicles automaticly by their weight?

Question

The reason of counting by pressure sensor is to, separate the vehicles by their weight.

Answer 1

The Swiss company Kistler makes products for precisely this purpose. You can find them at

http://www.kistler.com/do.content.ch.en-ch?content=70_RoadTraffic

Unlike some other technologies used for this kind of measurement, these are a good bit easier to deploy.

.

Answer 2

There are manufacturers of pressure sensors but you need to embed them in a special stretch of the road where they are bound to pass in a particular way over the sensor.

Since the size of the vehicle is usually correlated with the weight, you could try to count the vehicles and classify them into various categories using image processing.