A professional who interviews motor vehicle drivers at specified road intersection or highway to secure information for use in highway planning. Responsibilities include:

• Places equipment, such as barricades, signs, and automatic vehicle counting devices.
• Signals driver to stop, presents identification credentials, and explains reason for halting vehicle.
• Questions driver to obtain data, such as itinerary and purpose of trip.
• Records results of interview, and permits driver to continue journey.
• May secure information on load (either passenger or cargo) carried and type and weight of vehicle.