onClientRender

[Drakath]

function speed (player) 
    if player == localPlayer then 
        addEventHandler ( "onClientRender", root, draw ) 
    end 
end 
addEventHandler ("onClientVehicleEnter", root, speed) 
  
function hideSpeed (player) 
    if player == localPlayer then 
        removeEventHandler ( "onClientRender", root, draw ) 
    end 
end 
addEventHandler("onClientVehicleExit", root, hideSpeed) 

Sometimes it outputs: "addEventHandler: 'onClientRender' with this function is already handled". Why?

[Karuzo]

Use a variable to define that the eventhandler was added and then just check it

[tosfera]

It should only do that whenever your vehicle has been destroyed by a command, restarting a resource or with the default admin panel. If that's the case, the 'onClientVehicleExit' wont be triggered. You can solve it on another way if you like that;

function speed ( player ) 
    if ( player == localPlayer ) then 
        removeEventHandler ( "onClientRender", root, draw ) 
        addEventHandler ( "onClientRender", root, draw ) 
    end 
end 
addEventHandler ( "onClientVehicleEnter", root, speed ) 

Use a variable to define that the eventhandler was added and then just check it

or do that.