The speed limit is 100 km/h for the entire route. There is only one lane travelling in each direction along the entirety of the expressway.
History
The first section of the Obihiro-Hiroo Expressway opened on 15 March 2003 between the Dōtō Expressway and Hokkaido Route 1153 in Obihiro. The next addition opened three years later, extending the expressway 13.1 kilometres (8.1 mi) to Hokkaido Route 1157 (Obihiro Airport Road). In 2008 the route was extended to Nakasatsunai. After five years, the next section to Sarabetsu was added. As of February 2019, the most recent addition was completed in 2015, extending the route to its current southern terminus at Chūrui-Taiki Interchange.[2]
Future
There are plans to extend the expressway 15.1 kilometres (9.4 mi) south from Chūrui-Taiki Interchange in Taiki to Hiroo.[3]