[Cypress]

Right exact there is just an example for you out there

https://sampwiki.blast.hk/wiki/Function:IsPlayerInVehicle

so

pawn Код:

if(IsPlayerInVehicle(playerid, 403))

pawn Код:

CMD:tduty(playerid, params[])//Trucker-duty dialog
{
    if(IsPlayerInVehicle(playerid, 403))
    {
         ShowPlayerDialog(playerid, 2, DIALOG_STYLE_LIST, "Choose a route.", "Blueberry packaging.\nMainstreet ammunation.\nOff-duty (Removes the CP)", "Confirm", "Close list");
    }
    else return SendClientMessage(playerid, -1, "You are not in a truck!");
    return 1;
}