Using accelerator pedal force to increase seat belt use of service vehicle drivers.

Van Houten et al. (2011) installed a small spring under the gas pedal of six company vans. The pedal stayed stiff until the driver clicked the seat belt. Then the spring relaxed and normal driving resumed.

The researchers tracked morning and afternoon trips for each driver. They used a multiple-baseline design across vehicles to be sure any change came from the device, not outside events.

Every driver went from skipping the belt to buckling 100 % of the time the moment the pedal device was added. The change was immediate and stayed strong for the whole study.

No one tried to unplug or defeat the system. Drivers simply accepted the new rule: belt first, easy gas pedal second.

Van Houten et al. (2005) used a different prompt: a 5–20 s delay between buckling and shifting into gear. That trick also worked, but some drivers still rushed the sequence. The pedal-force method removes the wait and still hits perfect compliance.

Handleman et al. (1980) warned that buzzers and interlocks get disconnected 62 % of the time because people hate the noise. The 2011 device is silent and cannot be bypassed, so drivers comply instead of fight.

Older studies like Berler et al. (1982) and Haring et al. (1988) handed out raffle tickets or free sodas for buckling. Those rewards boosted use, but the gains faded when the prizes stopped. The pedal force needs no prizes; the natural consequence—easy driving—is enough.

You can copy this setup in any fleet, bus, or transport service. A $20 spring and a simple switch give full seat-belt use without nagging, prizes, or extra staff. If you manage drivers, ask your mechanic to add a belt-release solenoid to the accelerator. The behavior change is instant and maintenance-free.