What must a motor vehicle's maximum speed, determined by its construction, be at least if you want to use this road?

The image shows a sign indicating a road that is intended for motor vehicles. In Germany, this type of sign designates that the road is primarily for vehicles that meet a certain minimum speed requirement, which is typically 61 km/h or higher. This means that slower vehicles, like some bicycles or poorly constructed motor vehicles, are not permitted to use the road.

Such regulations ensure safety and efficiency on the road, as they prevent slower vehicles from impeding traffic flow. Understanding this sign helps drivers know what type of vehicles are allowed and the road conditions they can expect.