Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: A rush hour or peak hour is a part of the day during which traffic congestion on roads and crowding on public transport is worst.

Rush or Peak hour is the time of day that traffic on roads and crowding on public transportation is the worst.