[Hornet600]

add Engine to your enum then you should add something like vehicleinfo[vehicleid][Engine] = 0;

And when a players enters a vehicle make a check like this

for(new i; i < MAX_VEHICLES; i++)
{
ifvehicleinfo[i][Engine] == 0)
{
// freeze the player here
}
else
{
unfreeze
}
}