1. Backup your main.scm & script.img which are in directory ..gta san andreas\data\script
2. Replace with these
3. replace handling of FREEWAY with those to have a real chopper

FREEWAY 800.0 400.0 4.0 0.0 0.1 0.0 103 1.2 0.82 0.51 4 220.0 50.0 5.0 R P 10.0 0.47 0 35.0 0.65 0.20 0.0 0.09 -0.11 0.55 0.0 0.0 0.24 10000 1002000 205 1 1 6 


Till now there is 5 races from me nvknvk in los santos
press hold  sprint on desired number 0 to 4
if you want first person view hold "horn" for 1 sec

remark:
I make all checkpoints with mta san andreas -map editor
and edit (thanks to RUMBLE for little script, and i added mission races) with mission builder
0.33 (Bartoon Waterduck)
