[giorgosdim12]

Nice

Use GetVehicleVelocity for get speed to car for fix your anti-speed hack.

Code:

 if(IsPlayerInAnyVehicle(playerid))
        {
            new Float:Speed[3],Round_Speed;
			GetVehicleVelocity(GetPlayerVehicleID(p), Speed[0], Speed[1], Speed[2]);
			Round_Speed = floatround(floatsqroot(Speed[0] * Speed[0] + Speed[1] * Speed[1] + Speed[2] * Speed[2]) * 170.00);
            if(Round_Speed > 290)
            {
                TogglePlayerControllable(playerid, false);
                SetPlayerPos(playerid, 1941.1534,-1100.2391,-23.7885);
                ShowPlayerDialog(playerid, DIALOG_PRAVILA,DIALOG_STYLE_MSGBOX,"Anti-Hack", "{FFCC00}[Anticheat]"WHITE"[Anti-Cheat] You Have Been Banned for using Speed Hack!!!","Ok","");
                BanEx(playerid, "Speed Hack");
            }
   		}

or use #define GetPlayerSpeed GetVehicleVelocity and use

Code:

new Float:Speed[3],Round_Speed;
GetPlayerSpeed(GetPlayerVehicleID(p), Speed[0], Speed[1], Speed[2]);
Round_Speed = floatround(floatsqroot(Speed[0] * Speed[0] + Speed[1] * Speed[1] + Speed[2] * Speed[2]) * 170.00);