Abstract
An efficient working system requires good interaction among the man-machine and environment. In Thailand, the transportation for oil delivery uses the trucks. The oil delivery truck drivers must work long hours under uncomfortable positions which make their work inefficient for example sitting posture, dimension of the cab, etc. Sometime the accidents may be occurred. For this study the relationship between the anthropometric characteristics of the oil delivery truck drivers is interested. The objectives of this study were: 1) to fine out the seating problems of oil delivery truck drivers, 2) to study the relationship between anthropometric characteristics of the population of drivers and cab dimensions and 3) to recommend the appropriate cab design. The study involves constructing three-dimensional models for the 5th, 50th and 95th percentile from sample of 44 male drivers of the Petroleum Authority of Thailand. These models were then tested with the exiting cab. The subjective tests were used also. It was concluded that the exiting driver cab was not appropriate for 90 percent of the population. The seat to pedal, the seat to steering-wheel and the sitting height were the causes for discomfort and back pain. The recommended cab design dimensions were as follows: the seat reference point (SRP) to common heel point was 52-64 cm., and the height for SRP above the floor was 30-37 cm. The recommended design was found to differ somewhat from previous studies. This was probably because of the anthropometric difference.