In order for the flashing lights and siren to work, you will need to put 
"addon_vehtypes.ar" into your Midtown Madness 2 folder.
It can probably be found at "C:\Program Files\Microsoft Games\Midtown Madness 2"

However, if you have other cars with sirens, the sirens may not work after you 
install this file. To get them to work again, follow the steps below:

1. Go into your Midtown Madness 2 folder, and find the file names of all the cars 
with sirens. Write them down. 

Example: 

car_chevycop.ar
supercop.ar
whateverpolice.ar

2. Using Winzip or WinRAR, open "addon_vehtypes.ar"
Open the "aud" folder
Open the "shared" folder
Open the "vehtypes.csv" folder

This file will open in either a spreadsheet editor such as 
Microsoft Excel, or open in Notepad.


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If you are using a spreadsheet editor, simply add the filenames of the cars
with sirens from your list to the Police car row, BUT LEAVE OFF THE ".AR" PART. 
Example:

car_chevycop
supercop
whateverpolice


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If you are using Notepad, type the filenames WITHOUT THE ".AR" PART 
between the other entries and the ENDOFDATA marker. 
Example:

vpcop,vpsemi,car_silvereagle,car_crownvic,car_zpacey_ussrvan,vpbmw99,vppbmw,80p,car_chevycop,supercop,whateverpolice,ENDOFDATA

Make sure you put the comma's in the correct places, or else it will not work. 

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If you have any problems or questions, just post a message on the forum of your favorite MM2 fan site
and someone will help you out.