NFSUnlimited.net

Ok, so I have managed to enable police cars into my garage but what
I would like to know is how I can activate the siren/lights if possible?

Many thanks in advance!

From I know there is no way to do that. Hope the more advanced users know how. If there's a way to do it I also want to know.

That can't be done since. If there would be an in-game horn command button then yes, but like this no... hope they add a horn button to Undercover