We live near a highway that is well travelled by tourists in the summer, so I wanted to get a count of how many there were, so I built this vehicle counter. It is NOT complete because I'm still struggling with the sensor to use. Laser is best but requires a reflector across the highway. It's best because it is On-Off. My LIDAR sensors didn't have the range, and the ultrasonic (shown below) is "noisy", i.e. NOT On-Off, so filtering and multi-sampling must be done.