Abstract:
REQUIREMENTS FOR TRAFFIC MEASURING INSTRUMENTS ARE GIVEN. THESE INCLUDE ABILITY TO MEASURE AND RECORD SPEED AND SPACING OF EACH VEHICLE AND TO RECORD THE DATA ON EACH VEHICLE SEPARATELY. THE EQUIPMENT SHOULD AUTOMATICALLY RECORD THE MEASUREMENTS AND REDUCE THE DATA. FIELD EQUIPMENT SHOULD BE PORTABLE. TO PERMIT RECORDING OF DATA FOR EACH VEHICLE AND, AT THE SAME TIME, TO PERMIT THE AUTOMATIC REDUCTION OF THE DATA, IT IS PLANNED THAT DATA FROM EACH VEHICLE WILL BE RECORDED ON IBM CARDS. IN ORDER TO ACHIEVE PORTABILITY, MEASUREMENTS IN THE FIELD WILL BE RECORDED ON MAGNETIC TAPE FOR LATER TRANSCRIPTION ONTO IBM CARDS IN THE OFFICE. RECORDING ON THE TAPE WILL BE IN A CODE WHICH REPRESENTS THE SPEED IN MILES PER HOUR, THE TIME OF DAY IN HOURS, MINUTES, SECONDS, AND FRACTIONS OF A SECOND, AND THE LANE OCCUPIED BY THE VEHICLE. ALL MEASUREMENTS WILL BE BY ELEMENTS WHICH ARE FULLY ELECTRONIC IN OPERATION AND WHICH OPERATE IN A DIGITAL (AS OPPOSED TO A CONTINUOUS) MANNER. PROGRESS HAS CONSISTED OF BUILDING AN ELECTRONIC VEHICLE SPEED DISTRIBUTION RECORDER. SPEED IS MEASURED BY MEASURING THE TIME REQUIRED FOR THE VEHICLE TO TRAVERSE THE DISTANCE BETWEEN TWO ROADWAY PICKUPS PLACED THREE FEET APART. ELECTRO-MECHANICAL COUNTERS RECORD THE NUMBERS OF VEHICLES HAVING SPEEDS WITHIN TWELVE PREDETERMINED SPEED RANGES. THESE RANGES ARE VARIABLE BY MEANS OF SWITCHES ON THE THE PANEL OF THE INSTRUMENT. THE NEED FOR TRAFFIC DATA ON VOLUME, SPEED, LANE PLACEMENT, TURNING MOVEMENTS AND MANY OTHER PARAMETERS (IN A FORM WHICH IS EASILY REDUCIBLE FOR ANALYSES) IS DISCUSSED. /AUTHOR/
Supplemental Notes:
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