Abstract
THE PAPER PRESENTS THE CURRENT STATE OF KNOWLEDGE ON THE SIZE OF TRANSIT SERVICE ELASTICITIES COMPILED FROM DEMONSTRATIONS AND DEMAND MODELS. THE TRANSPORT SERVICE REVIEW FOCUSES ON PASSENGER RESPONSES TO CHANGES IN HEADWAYS, AGGREGATE VEHICLE MILES, AND COMPONENTS OF TRAVEL TIME. SERVICE ATTRIBUTES SUCH AS RELIABILITY AND COMFORT, FOR WHICH NO DEMAND ELASTICITIES ARE AVAILABLE, ARE REVIEWED IN TERMS OF THEIR IMPACT ON RIDERSHIP. IT IS CONCLUDED THAT SERVICE ELASTICITIES ARE HIGHER IN LOWER SERVICE AREAS AND RIDERSHIP IS MORE RESPONSIVE TO IMPROVEMENTS IN HEADWAYS THAN TO IN-VEHICLE TIME IMPROVEMENTS.