All roads in Saudi Arabia are operated by the Saudi Ministry of Transport. For speed limit enforcement, most of the western portion of the highway uses radar, while the eastern and central parts use traditional cameras. Fog-prone areas, especially in the eastern parts, are marked with huge signs with light warnings and the speed limit is reduced to 15 kmph (9 mph) in the case of fog. In February 2018, it was announced that the speed limit on key highways in the Saudi road network was being raised to 140 kmph (87 mph) from the previous 120 kmph (75 mph) for private vehicles, and Highway 40 was included in these.