The Ministry of Transport is preparing to raise the maximum speed allowed for cars on highways from 90kph to 120kph.
The ministerial regulation is currently at the drafting stage and all relevant agencies are finalising the details before its publication in the Royal Gazette, expected in early April, said Transport Minister Saksayam Chidchob.
Safety must remain a priority, while roads and environmental conditions would also be considered for the announcement.
The areas where cars would be allowed to legally reach 120kph must at least have 4 traffic lanes with median barriers and the road must be straight, without junctions or U-turns, he said.
In that case, the minimum speed for the right lane would have to be 100kph to prevent crashes, he said.
New speed limit signs will be put up in areas so drivers can see clearly where they must slow down or can speed up.
Signs setting a 30kph limit will be in residential or school areas, 60kph signs will be put up to reduce speeds on highways where motorists are approaching an intersection or U-turn, while 120kph will be for long, straight roads for cars not carrying more than 7 people.
Additionally, the ministry is considering whether to adjust the speed limit for other types of vehicles such as 90kph for lorries over 2.2 tonnes or carrying more than 15 passengers and 65kph for three-wheeled vehicles or tow trucks, 80kph for ordinary motorcycles and 110kph for superbikes of 400cc and above.