In very congested districts motor trucks are at a great disadvantage because they cannot be used at their most efficient speed. If the congestion can be eliminated or at least relieved by such means as one-way traffic, paving parallel streets, removing buildings which obstruct passage, widening driveways, elevating railroads and street cars, supplying overhead crossings, making subways, or by careful rearrangement and planning of terminal facilities, warehouses, and other accommodations, the cost of transportation in the large cities may be materially reduced. In many such cities public service commissions are studying these questions and applying remedies which will allow motor trucks to operate at a greater rate of speed and much more efficiently. Accurate observations of motor truck performance in city trucking business has shown that a large part of the day is given up to loading and unloading, that the truck stands still so much of the time that the cost is more nearly proportional to time than to mileage. Since certain charges such as interest and insurance go on whether the truck is idling or not, it is better to keep it moving. To do this effectively depots, warehouses, and other terminal facilities are provided to lessen the time of loading and unloading. It may be wise to hire an extra stevedore or two to assist with these operations, or mechanical devices may be installed where the saving will justify it. Usually there is not only a saving in time when a mechanical device is used but the amount of expensive manual labor is decreased.