Who is allowed to drive against traffic in a one-way street?

1. Correct answer: It is prohibited, except for a security vehicle on duty, or in accordance with a policeman’s directions
2. It is allowed for cyclists only
3. It is unconditionally prohibited, even when a policeman directs otherwise
4. It is allowed on holidays, when traffic is light and no disturbance is caused

WhyOnly security vehicles on duty, or someone following a police officer's direction, may drive against the traffic on a one-way road. Holidays and motorcycles are no exception.