Welcome to this quickstart website for TDMCars SVN. Due to Google Code shutting down, I've been forced to relocate the SVN.
If you're only interested in the new SVN link, then here it is
Using TortoiseSVN, you create a new folder in your addons folder, name it whatever you'd like, right click the folder and select SVN Checkout.
Then it will ask for a link. That is where you paste in the link, located above.
Any further assistance can be found on the other pages