What is the minimum speed limit on a freeway?

The minimum speed limit on a freeway is established to ensure that traffic flows smoothly and safely. A minimum speed limit of 40 km/h is set to prevent vehicles from moving too slowly, which could pose risks for both the slower vehicle and others traveling at higher speeds. This limit helps maintain a consistent speed across the lanes, reducing the likelihood of unexpected changes in speed that can lead to accidents.

Setting the minimum speed limit at 40 km/h reflects both safety and efficiency; it allows slower-moving vehicles to use the freeway while still enabling faster vehicles to pass without significant disruption. In the context of the other options, limits lower than 40 km/h could result in unsafe conditions where vehicles are either unable to keep up with the flow of traffic or cause significant congestion. This balance between maintaining a minimum speed and ensuring the safety and fluidity of traffic flow is vital for the design of freeway regulations.