In this situation, along which path or paths is it permitted to go around the obstruction?

Explanation

Sign 4.2.3 "Pass the obstacle on the right or left" allows going around the obstacle on either side, so both trajectories are allowed. It is a temporary sign set up at the obstacle, and where markings contradict temporary signs on portable stands, road users follow the signs, so the solid line does not rule out passing on the left (Rules, point 174, sign 4.2.3).