lane that is ready to turn into an exit, a merging lane, or a lane reserved for vehicles that have difficulty climbing high grade regions of the freeway. Freeway entrances may have traffic lights to control the flow of vehicles entering the freeway. Speed limit The speed limit for cars on Taiwan's freeways range from 80 km/h (50 mph) on Freeway No. 5 (north of Toucheng, Yilan) to 110 km/h (68 mph) on Freeway No. 3 (south of Tucheng, New Taipei). The speed limit for trucks are usually 10 km/h lower. In non-traffic jam conditions, a vehicle must travel at least 60 km/h (37 mph). Speed limits are enforced through radar activated cameras that take pictures of speed-violating cars. Because of protests, yellow warning signs are given in advance in Chinese of approaching radar activated cameras. Following distances As tailgating poses serious hazards of rear-ending, Article 6 of the Freeway and Expressway Traffic Control Regulation () requires the following minimum following distances when the weather is fine: Longer following distance is required in the Hsuehshan Tunnel. Traveling through tunnels In the tunnel portions of freeways, lane change is prohibited when the lane divider consists of two parallel solid lines, used when lane change is considered unsafe should a collision cause a vehicular fire. Headlights must be turned on when traveling through tunnels; this is enforced by special cameras. Unlawful lane change or failure to turn on headlights in a tunnel is subject to an administrative fine of 3000 new Taiwan dollars. Additional restrictions apply for the Hsuehshan Tunnel on Freeway No. 5, which is the longest tunnel in the entire system. Prohibited traffic Article 19 of the Freeway and Expressway Traffic Control Regulation prohibits uses of and entries onto the freeways by: Pedestrians. Military troops marching or conducting drills. Non-motorized vehicles Motorcycles (see also Restrictions on motorcycle use on freeways#Taiwan for more information). Three-wheel motor vehicles or motorized pedicabs. Farm machineries. Motorized machineries not being motor vehicles. Towed vehicles not disabled on the freeways or expressways. Electronic toll collection Odd-numbered freeways have tolls, which are automatically collected by ETC. The current rate for cars is (NT$1.2/km up to 200 km) + (NT$0.9/excess km), km being kilometers traveled per day. The first 20 km per day is free and thus deducted from the distance. Freeways may be used directly, but users are advised to apply for an “eTag”, which is free