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In this particular field study, the authors have demonstrated that telematics can be used to monitor and improve safe and fuel-efficient driving behavior. Telematics was used to monitor various driver performance parameters: unsafe events (sudden accelerations and hard braking expressed as Yellow and Red events, depending on severity), speeding, engine revolutions per minute (RPM), and fuel economy (miles per gallon). The drivers consisted of two groups: drivers of day cabs and drivers of sleeper cabs. The drivers of both groups were monitored during a baseline period during which no feedback, coaching, or rewards were provided. Then, the drivers of both groups were monitored during an intervention period, during which drivers were provided with feedback, coaching, and rewards.