Disallow collisions on vehicals?

Is there away that i can make it so that vehicles can not be no collided ever?

we have been using this for disabling it on the tool

[lua]
local DisallowedClasses = {}
DisallowedClasses[ “prop_physics” ] = true
hook.Add( “CanTool”, “NoNocollide”, function( pl, tr, tool )
if tool:lower() == “nocollide” and DisallowedClasses[ tr.Entity:GetClass():lower() ] then
pl:ChatPrint( “This entity cannot be nocollided.” )
return false
end
end )
[/lua]

what we need is away to disbale it from context menu.

is there a easy way of doing this?