长期以来，我国的公路管理体制是在计划经济和公路及公路运输供给紧张的情况下建立的。
Chinese highway administration system was built up on the conditions of the planned economy and the lack highway transportation supply for a long time.
路线和时间计划是为公路运输特定设置的，因为铁路和水路运输已经有严格的路线和时间表了。
The routing and scheduling is specific is for motor only because railway and water have strict routes and schedules.
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