Where I'm from if you're caught speeding in your taxi, you lose your licence to carry passengers for payment.
If you're charged with anything more serious than speeding, even if you're not in your taxi at the time, you lose it.
If you've lost your drivers license for any reason in the last 7 years, you can't even get a passenger endorsement.
You must have had your license for more than 2 years.
You must complete an approved P endorsement course.
You must pass background checks - this includes never been in prison for more than 12 months, never been convicted of any violent, sexual, drug, firearms or organised crime offence. Even if they were not committed in this country.
You must submit a medical certificate at least every 5 years.
You must be eligible to work in the country.
You must pass a practical driving test every 5 years
You must display an ID card in your vehicle visible to the passengers.
Everyone who carries a passenger for reward must have a P endorsement. Not just taxi drivers.
That's whats so special about taxi drivers.
Taxi drivers also have further regulation about the safety of their cars and the taxi meter installed.
They also pay extra fees to be allowed to park in taxi stands.
Additionally, taxi drivers need to be arrogant pricks who think they can park to pick up and set down passengers in clear ways, on yellow lines and anywhere else they think will hold up other traffic and piss off other road users.