There are some noise-handling pieces, but no public denoising API. E.g.: Wiener/unsupervised Wiener configs, NSR estimation, regularization, and simulation helpers for Gaussian/Poisson/readout noise. The crate is focused on deconvolution.
Low mph does not automatically imply that crashes are not serious. It does not say anything about speed of other vehicles. Tesla could be creeping at 2mph into flow of traffic, or it could come at a complete stop after doing that and still be the reason of an accident.