Salzburg is busy, congested and sprawling. It's best avoided really, so either blast past on the motorway, or cut the eastern corner and take this route. The main road between the Salzburgring and Hallein is well made and smooth, but it has a blanket 80km speed limit most of the way. Ignore it, as most locals do, but watch out for police at peak traffic times and weekends. It runs along a river, and the side of a lake and is hardly ever straight. Mostly sweepers.
I reccommend taking the short - 10km - detour up the road to Krispl, a one-yodler village on a low pass. The road has a lot less traffic and a couple of easy hairpins but is mostly sweepers in low alpine meadows. Nice scenery. The eastern end is twistier and runs along a river. An 'in' road for locals. Outsiders tend to ride past.