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Hello!

You can also use TogglePlayerControllable.

PHP код:

TogglePlayerControllable(playerid,0);
TogglePlayerControllable(playerid,1); 


So, he can't enter the vehicle.

PHP код:

new CanEnterCar = GetPVarInt(playerid, "Test");
if(CanEnterCar == 1) {
     return 1;
} else {
    SendClientMessage(playerid, X11_Red, "You cannot enter this vehicle!");
    TogglePlayerControllable(playerid,false);
    TogglePlayerControllable(playerid,true);
    // or
    //ClearAnimations(playerid);
    return 1;
} 


Mencent