Not a bad suggestion, actually.
It would definitely be helpful in overtaking on the C-D road, even though you are not meant to overtake there either way.
But nontheless, a good suggestion. +1
This is done by using Inspect Element. You access this by clicking the F12 Key that should be on your keyboard. Then the rest gets quite complex if you don't know what you're doing.
If you need any more help, feel free to drop me a PM here on the forums.