I do. Just as there are too many similarities between Kimba & Lion King for them to be coincidental, there are just as many between the White Planet & Speed Racer.
First, the cars:
- If you put one above the other, & viewed them from the side, their profiles are very similar.
- Their canopies open the same way.
- The Mach 5 jumps over obsticles in nearly the same way as the Black Falcon.
The races:
- Over any terrain
- dirty tricks
- team owners who scheme to have their drivers win at any cost
I cannot say that Tezuka originated all or any of these elements, though; but it is quite clear that he had them before the Seahorse guys put them in Mach Go Go Go anime. Mach Go Go Go anime dates to 1967; of course, they might have had these elements in their manga, & since only a few are in the WP manga, who can say who originated them?