^ The bane of commuters.
Ideally, all at-grade signalized intersections would be converted to limited-access interchanges and the parkway would be 6-laned. But I doubt that will ever happen.
Popes Head is far from the only "annoying" backup for commuters, but it does seem to get a large share of the rage around here.
The Fair Lakes Pkwy area used to get a lot of the blame, but that section has been fixed with the reconstruction and expansion.
It boils down to the Parkway wasn't designed for what it's become. Much of it follows the old Outer Beltway right-of-way (much like MD 200 over the river), but what was built wasn't designed to be an outer beltway. Yet it's sort of become that anyway due to commuter traffic.
It's in desperate need of across-the-board upgrading. The re-designation as a primary road (which prompted the change from Rt 7100 -> 286), the governor's transportation package (HB2313), and the county parkway study spearheaded by Supervisor Herrity should get the ball rolling, but it will be many years before fixes arrive.