Watch out for ginormous orange road work signs on Powder Mill Rd on both sides of the Patuxent Wildlife Refuge in PG County. I asked the construction crew to move them (citing danger to cyclists) but they didn't seem too receptive - so I moved them myself. They're still in the shoulder, but won't force you out into the street. I'm not strong enough to pick them up and put them in the grass.... I know of one cyclist who collided with a road work sign on a different section of Powder Mill Rd last fall (we have the remnants of the taco'd rim and damaged frame hanging at Proteus) - that cyclist was not seriously hurt. But our EMT friend in Utah recently responded to a call for a cyclist who had a fatal collision with a road work sign. Be careful out there!
Here's how the signs should be placed (I encountered this roadwork later on my ride on Beaver Dam Rd)