[YourLord]

i guess this would do better the job.

pawn Код:

native IsValidVehicle(vehicleid);


CMD:randcar(playerid, params[])
{
   new carid;
   while(!IsValidVehicle((carid = random(MAX_VEHICLES)))){}
   new
        Float:vPos[3];
   GetVehiclePos(carid, vPos[0], vPos[1], vPos[2]);
   SetPlayerCheckpoint(playerid, vPos[0], vPos[1], vPos[2], 5.0);
   return 1;
}

By the way, vehicleid is the ID of the vehicle. you can use the to get the vehicleid that the player is in.

https://sampwiki.blast.hk/wiki/GetPlayerVehicleID