Sounds amazing and I hope one gets invented, but there is another solution as well:

You could make the wheels out of steel and run them on a narrow road also made of steel instead of oil byproducts, so they would wear out much slower, and any dust would be similar to naturally ocurring iron oxides (becoming relatively inert once it mixed with mud even if there was still some respiratory risk). It would be better suited to higher speeds and big loads and would compliment the other invention (maybe you could even put the small two wheeled car on the big steel wheeled car). Some kind of self-driving system would also be necessary to keep everyone safe