Autonomous vehicles (AVs) have made significant progress in recent years, including entering the testing stage on urban roads. However, there still is a relative lack of knowledge on the public acceptance of AV road tests in their cities. This paper fills this gap by modeling the survey data collected by BikePGH in Pittsburgh. Special attention was paid to two types of typical vulnerable road users, bicyclists and pedestrians. An ordered probit model was built to investigate the factors associated with bicyclists’ and pedestrians’ willingness to support their city as an AV proving ground. The model results indicated that adults aged 65 years and older were more likely to support AV testing than those aged 25-44 years old. Bicyclists’ and pedestrians’ attitudes on the perceived safety and benefits of AVs were positively associated with the willingness to support their city as an AV proving ground. Also, we applied a mediation model to explore the suppressor variable, finding that the influence of interactive experience on bicyclists’ and pedestrians’ willingness to support AV tests in their city was mainly suppressed by the perceived safety of AVs. We recommend AV companies protect the rights of vulnerable road users when testing their AVs on proving grounds.
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