The ministry of transportation has some radar guns. There is no legislation regarding radar guns therefore the results of testing are not admissable in court.
Amanda,
radar guns aren't the only way to measure speed. Use a stopwatch. Measure off ten meters and clock the traffic with a stopwatch. 15mph=22feet/second. If I'm doing the math correctly, that's 6.7M/s, so if a cart travels ten meters in less than 1.5 seconds, it's going faster than 15mph. Or, make life easy on yourself and measure off 22 feet. Less than one second is speeding if the limit is 15mph.
Dan