"All towns in the region will have highway access in 2017," Sonam Chosphel, an official with Tibet Transport Department said.
"Gyalasa and Gandeng in Medog County are the last two roadless towns," he was quoted as saying by state-run Xinhua news agency.
Medog is China's last roadless county, and ended its isolation from the outside in 2013 with the opening of a highway.
China has extensively developed infrastructure with rail, road and air connections in Tibet.
"This year, the region will spend 52 billion yuan building or upgrading high-grade roads, national or regional key highways, and rural roads, withoperating highways surpassing 90,000 km," Sonam Chosphel said.
The roads linking the Medog County seat to the two towns began construction in 2015 and will be completed at the end of the year.
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