TRAVEL ROUTE SETTING SYSTEM, TRAVEL ROUTE SETTING METHOD, AND PROGRAM

A travel route setting system is provided. A passage time estimation section estimates a passage time at which a vehicle passes each of stop lines located before traffic lights present in a traveling direction on each of routes from a vehicle position to a destination. A solar position calculation section calculates a position of the sun at the passage time of each of the stop lines based on the position and the passage time of each stop line. The backlight margin value calculation section calculates a backlight margin value. A route backlight margin value calculation section calculates a route backlight margin value based on the backlight margin value of each of the stop lines present on each of the routes from the vehicle position to the destination. A route determination section determines a travel route from the vehicle position to the destination using the route backlight margin values.