The concept of Solid requires you to adjust a few settings before playing. While some are optional, they enhance the gameplay greatly. Here are some tips you will also find in the available map intros.
Turn off Bloom. This is a must for some players. (Bloom can make the road completely blind for you. Unless you like a challenge, it is not recommended.)
Turn on 'PostProcess FXs' in the advanced configure menu of your ManiaPlanet Launcher. (This will solidify the road some more and make your HUD better visible.)
Select the 'SOLIDCAR' skin from the profile menu. (When you're done playing, don't forget to change back. The skin doesnt transfer over to other titlepacks.)
While ghost medals have been driven, it is advised to keep them invisible. They can hinder your field of view a little.
Hope this guide helps you out. Have fun playing!