Some levels that appear in the path are made by players with a lower cc vehicle making you have to slow down wearly not achiving the result that was first intended. Even worst, if the player has a higher cc you may be forced to use nitros as I just had to do in Canyon rider from @NOob
or as in Wheel planet-like? from @Computer
they might not be enough making you have to skip the level in order to carry on.
This would all be fixed if adventure levels were played with the configuration of the builder.