Game version 5.1
New profile/save
Solo play

Problem:
Uppon completion of the first Contract "Old Bridge Reconstruction" the roadblock stay in place.
Side note:
When leaving to the main menu after completion of "Old Bridge Reconstruction" keyboard and gamepad have no effect beside the mouse.

Solution:
Restart the game roadblock is cleared.

played a new game (5.1?) this morning.
delivered everything to the bridge - had no road blocks.
Can not confirm this in 5.1 in a new game

Replayed this mission myself not long ago, Roadblock cleared instantly.

Although can also confirm the controller not working correctly when exiting to main menu. Mine will let me move up and down the selections but pressing A does nothing, using an XBox One Controller connected via wire.