April 1st marked the first day that 120 km/hr speed limit became effective, but only on the Bang Pa-in Highway to the Ang Thong Interchange, covering 50 kilometres.
In the right lane and interchange entrances and exits there are yellow rumble strips to alert drivers that they were entering and exiting the speed limit zone. U-turns are now closed off by barriers.
Issues were noted with some cars in the right lane, where there is a 100 KPH minimum speed requirement, still travelling below that speed and trucks were still using that lane.
The second phase, planned to be initiated in August, involves routes in the central, north, northeastern, and southern regions with a distance of approximately 260 kilometres.
By December, sections of main highways such as Highway 1, 2, 42, 340 and 44, will upgrade a total of 1,760 kilometres by December.
Drivers who have been made aware that the increased speed limits have been approved should not expect that these changes now apply to regional roads with speed limits signage still applying.