The Prithvi Highway, one of Kathmandu Valley’s key supply lines, has caved in at Phisling of Ichchhakamana Rural Municipality-3 in Chitwan district.

Only one-way traffic has been allowed along the highway after the road subsided this morning.

The road section was blacktopped a few months ago but due to incessant rain this monsoon, the edge of the road started to wear off leading to the cave-in.

The 174-km long highway connects Naubise of Tribhuvan Highway in Kathmandu to Prithvichowk in Pokhara and is one of the busiest highways in the country.

A traffic jam has formed in various road sections along the highway since the cave-in.