my_van.at_dead_end()
my_van.at_destination()
my_van.at_red_traffic_light()
my_van.at_green_traffic_light()
my_van.at_traffic_light(c)
# where c is 'RED' or 'GREEN'
my_van.is_road_forward()
my_van.is_road_left()
my_van.is_road_right()
my_van.is_road(d)
# where d is 'FORWARD', 'LEFT', or 'RIGHT'