Is a taxi owner or driver permitted to change the taxi’s ride fare?

1. Yes, after due notice of 26 days in advance.
2. Yes, up to 15% above the determined tariff.
3. Yes, 24 hours before the new tariff enters into force.
4. Correct answer: No.

WhyNeither the owner nor the driver may change the fare: tariffs are set by the Minister of Transport. Neither '15% more' nor advance notice helps.