When I was playing perris, I often saw that some CHP vehicles had a police light that was always on when getting off, but I tried a lot of buttons and it didn't work, and I wanted to ask how I could make his police light always on when I got off
For example:

Try : -, =, [, ].

Ok, thanks, I'll give it a try

I tried, but it didn't work

Just press J only.