Samenvatting
Before installation and after installation field surveys were conducted to determine the number of motorists needing aid along the roadway and the type of problems they had. Details of servicing times for the stopped motorists also were collected. Records were maintained for system installation and maintenance costs. The summaries of the field survey and system costs are included in the report. Costs for two other types of system (telephone and call box) used in other states are included for comparison.