Exactly what it says, what do you drive/ ride on a day to day basis to save your project from the day to day grind?
This may be because your car isn't finished yet, or you have to work/park where theft is a problem. Or your car is just to precious to use it up driving to and from work. Or your car may be so overpowered and completely impractical to drive in bumper to bumper traffic

There is no shame here, it doesn't matter what it is, tell us and post pics if possible, show us the extremes you go to to protect your ride... I actually think the more embarassing it is the better, it shows commitment and a determination to protect what you care about.