Solved issue

[turtles05]

why am I not able to crash into other cars I just go straight through the m but I can crash into walls and other things

 

[Mark]

Hi,

Does this happen only on multiplayer or on singleplayer as well?

You can enable collisions on multiplayer: hover your mouse near the top of the screen - you'll see a menu.
In that menu, hover over "Settings" and near the bottom, make sure the "Collisions" checkbox is checked (has a white square)

 

[turtles05]

oops forgot to enable collisions in settings