The smart car has a unique automated manual transmission (5-speed), featuring paddle shifters.
6. smart car Transmission Facts
This 5 speed clutchless transmission can be operated in either mode by the driver, Here's how:
Automatic - Engage transmission in automatic mode by shifting the console stick to D-Drive and let the transmission shift for you.
Manual - Engage the manual transmission mode by moving the stick to the "left side" and manually shift the gears "up or down" using the stick or the shift paddles located on the steering wheel.
Here's a tip to help you with the smart car's manual transmission if you already know how to drive a stick...
Put your left leg on the floor and do not use it.
When you need to shift, push down on your left foot just like you would engage the clutch (I call this a "fake" clutch).
Next, let up on the gas peddle with your right foot, just like you normally would in a stick.
Use the stick on the floor and push it up to "climb" up in gears or push down to lower the gears.
This technique will allow you to keep your "stick shifting" technique smooth that you are accustomed to performing.
If you don't know how to work a clutch, then just remember to let up on the gas before you shift the stick and then give it gas while using your right foot after you shift gears.
I found that the autmomated manual transmission was fairly easy to use, though the actual shifting was a bit sluggish at times. With the paddle shifters, though, it was smooth sailing!