One hundred and fifty-seven collisions occurred at railroad crossings last year in Minnesota. That's the seventh worst record in the country. The Minnesota Department of Transportation and 3M are collaborating on a system intended to prevent crashes between trains and other vehicles. It's a warning device that can be installed in a car, bus or truck and is triggered by a radio signal from a transmitter located at the crossing. The system is being tested on school busses in Glencoe. We talk about it with Lynn Ihlenfeldt of 3M, one of the project managers.