RURAL MAIL CARRIER MOTOR VEHICLE OPERATING COSTS ON VARIOUS TYPES OF ROAD SURFACING

OPERATING COST RECORDS FOR 293 CARS OPERATED BY RURAL MAIL CARRIERS IN IOWA AND INDIANA HAVE BEEN ASSEMBLED, SUMMARIZED, AND ANALYZED FOR THE PURPOSE OF DETERMINNG THE OPERATING COST DIFFERENTIALS FOR VARIOUS TYPES OF ROAD SURFACES. A STUDY OF CAR COST RECORDS IS CONCLUDED. UNIT OPERATING COSTS WERE DETERMINED FOR EACH TYPE OF ROAD SURFACE FROM THE DETAILED DAILY RECORD OF THESE CARS COVERING EVERY PHASE OF OPERATION. FROM THE GRAPHICAL ANALYSIS THE AVERAGE COST OF OPERATION FOR THE YEAR-ROUND CONDITION WAS FOUND TO BE ABOUT 7.8 CENTS PER MILE FOR EARTH, 4.5 CENTS PER MILE FOR GRAVEL, AND 3.8 CENTS PER MILE FOR PAVEMENT. THE UNIT COST OF TRANSPORTATION BY REPLACEMENT OF CARS WITH HORSES, ETC., WHEN THE ROADS WERE IMPASSABLE TO CARS, AVERAGED ABOUT 11 CENTS PER MILE AS COMPACTED TO AN AVERAGE OF LESS THAN 5 CENTS PER MILE WITH THE CARDS. THE AVERAGE RATE OF TRAVEL, INCLUDING STOPS, WAS 14.0 M.P.H. ON GRAVEL AND PAVEMENT AND ABOUT 7.0 M.P.H. ON EARTH. FROM THE STATISTICAL ANALYSIS BY THE METHOD OF LEAST SQUARES, THE AVERAGE COST OF GASOLINE, OIL, TIRES AND MAINTNENACCE FOR THE YEAR WAS 3.14 CENTS PER VEHICLE MILE ON EARTH, 2.54 ON GRAVEL, AND 1.55 ON PAVEMENT. THE TOTAL UNIT COSTS OF OPERATING AN "AVERAGE" CAR FOR 8,000 MILES ANNUALLY BASED ON THE RESULTS OF THIS STUDY AMOUNTED TO 6.22 CENTS PER MILE ON EARTH, 5.62 ON GRAVEL, AND 4.63 ON PAVEMENT. THE MULTIPLE CORRELATION COEFFICIENTS OBTAINED BY THE LEAST SQUARES METHOD WAS 0.89 FOR THE TOTAL UNIT COSTS, 0.98 FOR GASOLINE COSTS, 0.95 FOR TIRE COSTS, 0.78 FOR OIL COSTS, AND 0.60 FOR MAINTENANCE COSTS. APPLYING THESE DATA TO DETERMINE THE TRAFFIC VOLUME NECESSARY TO JUSTIFY AN INVESTMENT OF $1000 PER MILE AND AN EXTRA MAINENANCE COST OF $40 PER YEAR IN IMPROVING A COUNTY TRUNK EARTH ROAD WITH A GRAVEL SURFACE, IT WAS FOUND THAT 35 VEHICLES A DAY ARE REQUIRED IF OPERATING COSTS ONLY ARE CONSIDERED, AND 7 VEHICLES A DAY IF THE FACTORS OF MILEAGE, AGE, EXTRA HELP, AND TRAVEL TIME ARE EVALUATED. ALSO, AN ANNUAL EXPENDITURE OF MORE THAN $500 PER MILE OF ROAD PER 1,000 VEHICLES OF TRAFFIC PER DAY FOR SNOW AND ICE REMOVAL IS JUSTIFIED BASED ON THE SAVINGS IN OPERATING COSTS, TIME, AND REDUCTION IN ACCIDENTS, RESULTING FROM COMPLETE SNOW AND ICE REMOVAL. /AUTHOR/

  • Supplemental Notes:
    • Vol 18, Pt 1, PP 41-60, 12 FIG, 7 TAB;. part of Report of Department of Highway Transportation Economics
  • Authors:
    • Moyer, R A
  • Publication Date: 1939

Media Info

  • Monograph Title: Proceedings of the Eighteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. November 28-December 2, 1938. Part I
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00201915
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 1 1971 12:00AM