This paper reports the results of level road acceleration performance measurements of a group of randomly selected intercity diesel trucks. The ratio of gross combination vehicle weight to gross engine horsepower is correlated with acceleration performance. The results of the tests are presented in the form of graphs displaying distance versus time, speed versus time, and distance versus speed for weight-to-power ratios of 100, 200, 300, and 400 lb/hp. The effect of high torque rise engine with 5-speed transmissions as well as transmission shift time on acceleration performance is also reported. A graphical determination of passing time and passing distance for a low-speed pass maneuver as used by the Department of Transportation for passenger cars is presented based on actual acceleration performance data.