Except at construction sites, the general speed limits, where they apply, are usually between 100 km/h (62 mph) and 130 km/h (81 mph); construction sites usually have a speed limit of 80 km/h (50 mph) but the limit may be as low as 60 km/h (37 mph).[29] In rare cases, sections may have limits of 40 km/h (25 mph),[30] or on one ramp 30 km/h (19 mph).[31] Certain stretches have lower speed limits during wet weather.