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Sleep Envelopes and Sleeper Berth Requirements

The maximum length, width, and height of 239 truck and bus drivers assuming three sleep postures were measured. The Federal government sets minimum dimensions for sleeper berths in trucks. A sleeper berth of minimum width (0.61 m) would be too narrow for over 40% of the drivers as measured in this study. A minimum width of 0.84 m is recommended to accommodate 90% of the driver population.