This paper presents: (i) an operational definition of risk exposure, (ii) a questionnaire developed to measure exposure, (iii) validity studies of estimates of the distance traveled and time spent driving for different permit holder categories, (iv) a feasibility study for a telephone survey on exposure. Results show that long distance truck drivers from one company studied estimate accurately their distance driven on the last worked day, Montreal Urban Community Transport Commission bus drivers estimate well their time behind the wheel, while a convenience sample of private car drivers (coworkers and friends) estimate well their previous week distance and time on the road. Phone surveys appear to be an efficient and cost effective method for risk exposure data collection.