Do you have taxi rules?
I usually am in a hurry so the fastest way to get from A to B is with a cab(taxi).
I have seen so many taxis and taxi drivers that I created my own rules.

Rule 1: Never enter car that looks like its older than you are.

If you don't like bumpy rides than follow this rule with at all times. If I'm in a real hurry than I will just take the first cab that gets in my way. Sometimes I have the "luck" to ride in cabs with witch I feel every dent in the road and and the car look like its going to break at the next light stop.

Rule 2: Never enter car that is too new

Maybe it sounds strange. This is not a rule that you should always follow. Some drivers like to keep they're car shiny new and they will drive as careful as they can and as SLOW as they can. Sometimes you will arrive faster to point B and sometimes it will take ages for the taxi driver to get you there.
The only good thing about this is that you will always have a smooth ride. The car suspensions are new so you will have a very nice ride.

Rule 3: Never pick a taxi with an old driver

I have nothing against old people. Not all of them anyway.
If you get in a cab with an old driver, your changes of him driving as slow as my grandmother on a tricycle have just increased exponentially.

So what rule have I broke today? The third rule. The most sacred rule of all. Man, this guy was driving like he had a 10km/h limit on all streets or something. At one point I wanted to get out of the car to get some air and I was sure I will catch up with him if I do that.
I saw a 80 year old women on the sidewalk. She could of given me a piggyback ride faster than this guy.