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Apple QuickTime movie  |  1996-06-03  |  10.3 MB  |  300x228  |  0.573fps  |  47 seconds  |  [MooV/TVOD]
Transcription: A bulldozer is used to level the land where the road will be built following the plans and surveyors' markings. It helps to set the grade of the road. The bulldozer is also used to move obstacles like tree stumps and boulders. It can spread dump piles of sand, gravel, stone or soil. The bulldozer uses tractors instead of wheel. The tracks spread out the weight of the bulldozer so that it doesn't sink into the soft soil or loose gravel. The bulldozer operator can raise, lower, or tilt the thick steel blades from within the cab using levers.