FUEL AND TIME CONSUMPTION RATES FOR TRUCKS IN FREIGHT SERVICE

THE NUMBER OF TIMES A TRUCK MUST CHANGE ITS SPEED IN A MILE OF TRAVEL INCREASES WITH THE DENSITY OF TRAFFIC, ACCORDING TO AN ANALYSIS OF DATA DERIVED FROM STUDIES CONDUCTED IN 1957 AND 1958 OF RURAL AND URBAN TRAVEL IN FIVE STATES--DATA NECESSARY IN THE ANALYSIS OF HIGHWAY-USER BENEFITS. USING A CONGESTION INDEX, WHICH INDICATES THAT SPEED CHANGES PER MILE INCREASE UNIFORMLY WITH AVERAGE DAILY TRAFFIC FOR DIFFERENT TYPES OF HIGHWAY, TOGETHER WITH THE RATES OF FUEL AND TRAVEL TIME CONSUMED DURING A CHANGE IN VEHICLE SPEED, THE ADDED COST OF OPERATING AT NONUNIFORM SPEED COULD BE ASSESSED. THIS ARTICLE ALSO SHOWS THAT, FOR THE GROSS VEHICLE WEIGHTS OBSERVED, SMALLER AND LESS POWERFUL ENGINES GIVE BETTER FUEL ECONOMY, BUT THEIR USE CARRIES A PENALTY OF INCREASED TIME-CONSUMPTION (LOWER ROAD SPEEDS) AT THE HIGHER GROSS VEHICLE WEIGHTS. TRUCKS WITH DIESEL ENGINES WERE FOUND TO TRAVEL ABOUT 50 PERCENT MORE MILES ON A GALLON OF FUEL THAN TRUCKS WITH GASOLINE ENGINES OF APPROXIMATELY EQUIVALENT POWER AND GROSS WEIGHT CHARACTERISTICS.

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  • Accession Number: 00201528
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 19 1994 12:00AM