Bus on Hobart's eastern shore hits woman

A 65-year-old woman is in a critical condition after being hit by a bus in Hobart's eastern suburbs.

She was struck on the East Derwent Highway at Rose Bay around 9.30am on Friday.

One eastbound lane of the Tasman Bridge was closed for several hours as police investigated.

"It is unclear as to why the female was on the road at the time," Sergeant Luke Walker said, adding police are appealing for any witnesses to come forward.