stock PullVehicleIntoDirection(vehicleid, Float:x, Float:y, Float:z, Float:speed)
{
new
Float:distance,
Float:vehicle_pos[3];

GetVehiclePos(vehicleid, vehicle_pos[0], vehicle_pos[1], vehicle_pos[2]);
SetVehicleZAngle(vehicleid, atan2VehicleZ(vehicle_pos[0], vehicle_pos[1], x, y));
x -= vehicle_pos[0];
y -= vehicle_pos[1];
//z -= vehicle_pos[2];
distance = floatsqroot((x * x) + (y * y)/* + (z * z)*/);
x = (speed * x) / distance;
y = (speed * y) / distance;
//z = (speed * z) / distance;
GetVehicleVelocity(vehicleid, z, z, z);
SetVehicleVelocity(vehicleid, x, y, z);
}
forward Float:atan2VehicleZ(Float:Xb,Float:Yb,Float:Xe,Float:Ye);// Dunno how to name it...
stock Float:atan2VehicleZ(Float:Xb,Float:Yb,Float:Xe,Float:Ye)
{
        new Float:a = floatabs(360.0 - atan2( Xe-Xb,Ye-Yb));
        if(360 > a > 180)return a;
        return a-360.0;
}

    if(!strcmp(cmdtext, "/car1", true))
    {
	   GetPlayerPos(playerid, xs, ys, zs);
	   car1 = AddStaticVehicleEx(411, xs, ys, zs, 0, 1, 1, 15000);
	   return 1;
	}

    if(!strcmp(cmdtext, "/go", true))
    {
	   SetTimerEx("Drive", 1000, true, "i", playerid);
       return 1;
	}
In "Drive" public:

   GetVehiclePos(GetPlayerVehicleID(playerid), xs, ys, zs);
   PullVehicleIntoDirection(car1, xs, ys, zs, 1);
   PullVehicleIntoDirection(car2, xs, ys, zs, 1);