[Chriham3]

On top of your script under the defines add this:

pawn Код:

new lockedvehicle[5];
new whatever[MAX_PLAYERS] = 0;
new status[MAX_PLAYERS] = 0;

Then in the Gamemodeinit add this, but make sure you edit it first orelse you will get warnings:

pawn Код:

lockedvehicle[0] = CreateVehicle(VEHICLEID, X, Y, Z, ROTATION, COLOR1, COLOR2, RESPAWNTIME); // defines locked vehicle number 1
    lockedvehicle[1] = CreateVehicle(VEHICLEID, X, Y, Z, ROTATION, COLOR1, COLOR2, RESPAWNTIME); // defines locked vehicle number 2
    lockedvehicle[2] = CreateVehicle(VEHICLEID, X, Y, Z, ROTATION, COLOR1, COLOR2, RESPAWNTIME); // defines locked vehicle number 3
    lockedvehicle[3] = CreateVehicle(VEHICLEID, X, Y, Z, ROTATION, COLOR1, COLOR2, RESPAWNTIME); // defines locked vehicle number 4
    lockedvehicle[4] = CreateVehicle(VEHICLEID, X, Y, Z, ROTATION, COLOR1, COLOR2, RESPAWNTIME); // defines locked vehicle number 5

Add this stock anywhere..

pawn Код:

stock IsALockedVehicle(vehicleid)
{
    for(new i;MAX_VEHICLES>i;i++) 
    {
        if(vehicleid == lockedvehicle[i]) return 1; 
    }
    return 0;
}

pawn Код:

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{
    if(ispassenger) return 1;
    if(IsALockedVehicle(vehicleid)) // if is a locked vehicle
    {
        if(whatever[playerid] != 1) // what ever variable you need is not 1
        {
            new Float:x, Float:y, Float:z;
            SendClientMessage(playerid, -1, "You can't enter this vehicle.");
            GetPlayerPos(playerid, x, y, z);
            SetPlayerPos(playerid, x, y, z+0.5);
        }
    }
    return 1;
}

Now, whenever you try to enter that vehicle it will deny you and say it is locked.
To unlock it, make some sort or command or any other function to unlock it for only that player id with

pawn Код:

whatever[playerid] = 1;

and lock it for that player again with

pawn Код:

whatever[playerid] = 0;

Example on OnPlayerCommandText

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if(strcmp("/lock", cmdtext, true, 5) == 0)
    {
        if(status[playerid] == 0)
        {
            whatever[playerid] = 1;
            status[playerid] = 1;
            SendClientMessage(playerid, -1, "Unlocked.");
            return 1;
        }
        if(status[playerid] == 1)
        {
            whatever[playerid] = 0;
            status[playerid] = 0;
            SendClientMessage(playerid, -1, "Locked.");
            return 1;
        }
        return 1;
    }
    return 0;
}

The outcome is:

[ame]http://www.youtube.com/watch?v=YSe4l6ORlaM[/ame]