As TV Tropes explained:
"In comics and cartoons, someone running or driving very quickly will leave a trail of fire in his or her wake.
Can be justified, albeit thinly, in the case of a wheeled vehicle (friction causes heat and tires are flammable — though in that case only the tires should be burning).note Other times the trail of fire isn't caused by tires or indeed wheels, which may make you wonder what exactly is causing those flames. But honestly, when this trope is employed well, you won't worry about such niggling little details. It's cool."

Side note: This is one of those tropes that aren't "fetish-based" I loved seeing everytime.. ;P
I loved this piece personally so I decided to put in the main gallery along with the folder.. heh

Someone seems to have caught raw footage of me racing in the streets of a japanese town. I'm just glad these blue shells and lightnings are banned... ^^'