The ...............

 .................... Dartford Crossing in Kent, UK - as seen from the air.

Also known as The Queen Elizabeth II Bridge - it carries the M25 over the River Thames east of London -  it is actually the A428 and not classed as a motorway - however it is considered a part of the M25 motorway route.  
Travelling southbound you cross the over bridge, travelling north you go through a tunnel.  There is a cost each time you cross (motorcycles go free) and is a well known bottleneck for traffic.

More info here if you are interested.

~ Anni ~



Backblipped on Thursday 18 October 2018