From the Super Mario Wiki
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A Blue Car is an automated obstacle found in Mario Kart: Double Dash!!, Mario Kart Wii, and Mario Kart 7. It is found only in Mushroom Bridge of the Flower Cup, and in Mushroom City of the Star Cup in Double Dash!!. They reappear in Mario Kart Wii, but only in Moonview Highway. They are found driving on their own at a relatively low speed on the main streets. They are not found driving on shortcuts so it is sometimes safer to take a shortcut than to get hit. In Mario Kart 7, they are found in Wuhu Loop and act much the same as before. They are now depicted as a dark blue hatchback, instead of a light blue sedan. Aside from color, they are virtually the same as the Red Cars.
The effect of hitting a Blue Car has the same effect as hitting a banana in Mario Kart: Double Dash!!, simply leading to a wipe-out. Getting hit by it in Mario Kart Wii causes drivers to flip over or get flattened momentarily. They can not be destroyed; they can be harmed only by hitting it while using a Star, by running it over with a Chain Chomp, by hitting it with a Bowser Shell, or by running into it while using a Bullet Bill or Mega Mushroom.