A system may receive information indicating a driver requesting a shared vehicle, estimate, based on web browsing information associated with the driver, one or more characteristics of the driver, determine, based on the characteristics of the driver, a driver safety score indicating an estimated risk of an accident involving the driver, select, from a plurality of available vehicles, a subset of the plurality of available vehicles based on the driver safety score, and cause the display of a user interface offering the subset of the plurality of available vehicles to the driver.