You are driving a car with three passengers (four people in total). May you use this lane?
Explanation
A lane marked with the "A+" symbol together with the "4+" symbol is open not only to route transport but also to cars carrying four or more people. It is meant to reward car-sharing and ease congestion, so with four on board you may use it.
KET reference: KET 181¹.4: A lane marked with the "A+" symbol is forbidden to non-route vehicles, except cars carrying 4 or more road users where the lane bears the "4+" symbol.