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汽车轮胎应具有足够的充气压力,才能安全顺利地工作。轮胎充气压力过高或过低,都会严重地影响轮胎的使用寿命。大型载重汽车的轮胎充气压力一般要求保持在90～120磅/平方英寸,但美国林务局却在该局所辖林区采取了将运材汽车轮胎充气压力降低到20～55磅/平方英寸的做法。这一做法颇具有悖常理之嫌,也曾引起过众多的争议和议论。赞成者有之,反对者也有之,褒贬不一。然而,这种新做法,或称新技术经事实证明,在经济上、技术上都是可行的,具有较高的实用价值。
Car tires should have sufficient inflation pressure to work safely and smoothly. Tire inflation pressure is too high or too low, will seriously affect the service life of the tire. Tire inflation pressures for large trucks are normally required to be 90 to 120 psi, but the U.S. Forest Service has taken measures to reduce the inflation pressure on the tires of the transportation vehicles to 20 to 55 psi way of doing. This practice is quite perverse and has aroused many controversies and discussions. Pro-those who have, opponents also have mixed reviews. However, this new approach, or new technology, has proved to be economically and technically feasible and of high practical value.