Newly constructed roads of this category have an 80 km/h limit such as Heung Yuen Wai Highway.
The Hong Kong government has stated that road safety is of primary concern when setting speed limits.
In practice, however, these limits have been adjusted relatively frequently due to the construction of new roads and increasing urbanisation in the New Territories.
In the 1980s, most rural carriageways had a speed limit of 70 km/h,[2] but many have since been reduced to 50 km/h in light of the increased development and the diversion of traffic to high-standard expressways.
At the same time, a higher speed limit of 80 km/h has become standard for newly constructed trunk routes.