Want to control a couple of DC motors with your Arduino? With this plug an play shield it's all possible BUT this shield also makes provision for a lot of other peripherals you might need for your robotics project..... You're getting a lot of features for your money!
Useful Info on Shield: Click to download
Full Tutorial: Click for tutorial
From the above pin indications it quickly becomes clear that this shield addresses a lot of your robot car needs.
1 - Connect your DC motors here
2 - Connect the power for the board here
3 - Connect your servo here
4 - Connect your ultrasonic sensor here
5 - You can connect some RGB LED's on this port
6 - Analog connections for potential sensor expansion