Widening parts of Interstate 95 between Richmond and Washington, D.C., should be Virginia’s top transportation priority, according to a new study that ranks 50 transportation projects that an outside research group says are critical to the state’s economic well-being. A host of other Northern Virginia transportation upgrades are among the top 10 projects cited as priorities by the group, including the construction of high-occupancy toll (HOT) lanes on I-95/395; the widening of Interstate 66 through Prince William, Fairfax and Loudoun counties; and extending Metrorail service from Fairfax to Ashburn. The report by TRIP, a national transportation research group based in the District, said all 50 of the projects it identified are critical to Virginia’s economy, but it did not specify how those projects would be funded.