Installation instructions:
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Import files from the folder "Import into IMG" with the program SparkIV or OpenIV
file(s) sabre.wft, sabre.wtd into the archive C:\Program Files\Rockstar Games\Grand Theft Auto IV\\pc\models\cdimages\vehicles.img;


Replace the lines with the settings

vehicles.ide
cabby, cabby, car, CABBY, CABBY, VEH@STD, NULL, 30, 999, 0.2473, 0.2473, 0, 2, 1.2 ,1, ext_taxi+ext_requi

handling.dat
CABBY 2200.0 4.0 85 0.0 0.0 -0.2 0.0 5 0.14 1.0 135.0 0.20 0.65 0.7 35.0 1.15 0.85 15.0 0.15 0.47 1.7 0.9 0.8 0.15 -0.15 0.0 0.5 1.0 1.0 0.8 1.5 0.0 25000 440040 0 0

carcols.dat

cabby, 89,89,1, 127,127,127,89,1,1

Files vehicles.ide, handling.dat, carcols.dat are located in the folder: C:\Program Files\Rockstar Games\Grand Theft Auto IV\\common\data\