Carcol Siren IDs

I understand the basic idea of Carcol Siren IDs, but I have always just changed them to random numbers until the lights start working, but is there a specific method or is there certain numbers that won’t work other than the numbers of the default gta cars?

I have had the most luck using 7-digit numbers with no repeating numbers, usually starting with an 8 or 9, such as 9463527 or 8245719, for example. Other than that, you’re pretty much guessing until you find one that works.

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