Sweden operates dynamic speed limit systems on several major motorways, particularly around Stockholm and Gothenburg. These limits change based on real-time traffic, weather, and road conditions — and they are fully legally enforceable.
How They Work
Sensors embedded in the road and cameras monitor traffic density, speed variance, and weather conditions. A central traffic management system calculates the optimal speed limit and displays it on overhead gantry signs. Limits may change every few minutes. Variable limits are typically used to smooth traffic flow and reduce stop-start congestion.
Common Variable Limits
On motorways with a standing maximum of 120 km/h, variable limits of 80 or 100 km/h may be displayed during heavy traffic, poor weather, or near incident sites. A blank sign (or a sign with no number) means the standard fixed limit applies.
Compliance
Variable limits have the same legal force as fixed signs. Fixed speed cameras and mobile enforcement units operate on variable-limit motorways. The variable limit you see as you pass the gantry is the limit — not the one you saw 2 km back.
Exam tip: A variable limit sign showing 80 on a normally 120 km/h motorway is mandatory — the reason for the reduction (weather, congestion, incident) does not affect your obligation to comply.