Federal Communications Commission Notice of Inquiry on Interference from Ignition Systems

3. The interference from a single vehicle that is complying with the SAE standard can be of small intensity and short duration. However, the collective effect of a flow of vehicles from a nearby thoroughfare degrades radio reception to a degree dependent on the traffic rate. Most affected are mobile units since they receive radio signals while surrounded by a number of other motor vehicles. Often a vehicle limits its own reception capability by the radio noise it generates. This has