So far I’ve been through about 250 cars and found these for Safety lights:
2014 Alfa Romeo 4C
2015 Audi RS 6 Avant
2016 BMW M4 GTS
2011 Bugatti Veyron Super Sport
2017 Chevrolet Camaro ZL1
2016 Lamborghini Aventador LP750-4 SV
2011 Mercedes-Benz SLS AMG
2012 Porsche Cayenne Turbo
2014 Volkswagen Golf R
The 1959 Jaguar Mk II 3.8 and Ford Crown Vic would be the ones with police lights.
I have these listed in my www.bit.ly/FH4spreadsheets in the “Aero/kit Options column” so you can see which ones I’ve checked, blank cells means I haven’t checked yet.