Call them the Jameson Canyon bottleneck-busters. They are building what is supposed to be the solution to eastbound, mile-long evening Highway 12 backups. While the highway through Jameson Canyon is two lanes in each direction, that drops to one eastbound lane just before the freeway. Support local news coverage and the people who report it by subscribing to the Napa Valley Register. A one-lane connector ramp between highway and freeway is the culprit and a two-lane ramp is the planned solution. That will get rid of a much-maligned merge point. This is a $77 million project in Solano County that should benefit Napa County, given Highway 12 is the main link between Napa County and the Central Valley.