Part 1: Intermodal Transfer Facilities: Evaluation of the Effectiveness of Connection Protection in Improving Successful Light Rail-to-Bus Transfers

Abstract

The quantitative evaluation results of the nation's first light rail–to-bus connection protection (CP) system implemented by the Utah Transit Authority are presented. The CP system was designed to improve the reliability of transfers from the higher-frequency light rail TRAX trains to the lower-frequency bus services. The CP system examines the estimated arrival time of TRAX trains for the next three stations and issues a “hold at {station name} until {time}” message to buses waiting at the connecting rail stations, via the buses’ onboard mobile data terminals, if the lateness of trains is within a predetermined threshold (e.g., 3 min). The evaluation consisted of a quantitative analysis of the successful rail-to-bus connections with an analysis of the rail and bus operations data and a qualitative assessment of the perspectives and opinions of users based on individual experience (both riders and bus operators). The focus was the quantitative analysis that employed an unmatched with-and-without experimental design. Overall, the analysis results showed that CP did significantly increase the percentage of successful train-to-bus connections. Train riders meeting a bus trip when CP was active and a “hold until” message was issued to the bus operator were between 3.1 and 3.9 times more likely to have had a successful connection than were train riders meeting the same bus trips when CP was inactive, depending on the wait time assumption for a successful connection to take place.