If they're blocked, they usually just leave. It's a tight t-junction between the hill outside a lunar-surfaced lane that constitutes the street behind us. The green waste lorry appears unable to turn corners (they bought a new lorry, the old one was fine). I grinked about this once to Biffa and the chirpy 'waste collection executive' said 'oh no, that's not a new lorry, it's the one we have always used' so I sent her a nice picture of a brand new, shiny lorry with this year's plates (I looked them up) visibly wedged in the junction (it was there for four hours, so I didn't have to hurry). In the spirit of customer service, she never replied and I figured it was their problem. Mostly it reverses up the road, stops, and then drives back down. Comes back the next day. Repeats.