This means you have activated the a

This means you have activated the air brake simulation. It basically means that every time you use your brakes, pressure drops and when it's low enough the truck won't move. In order to recover, put it in neutral and raise your revs. After a few seconds you'll notice the gauge climbing above red and you'll be good to go.

Or just turn the setting off in the options.

ผลลัพธ์ (อังกฤษ) 2:

这意味着你已经激活空气制动仿真。这基本上意味着你每一次使用刹车，压力下降，当它是足够低的车不动。为了恢复，把它放在中性和提高你的转速。几秒钟后，你会注意到表上面爬红你会好的。

或把放在选项。