This is unknown but it's likely to be evenings when people aren't at school/work.
It means a part of day when traffic or crowd is at its highest point in the day.
The purpose of traffic signals is to regulate motor vehicles during traffic hours during the day
Around 1.6 billion for both.
The rate of traffic deaths at night is higher than the one during the day.
At noon.
Crosstown traffic is murderous at this time of day. Why is the traffic at a stop during "rush hour"? How's traffic right now?
Pollution levels are usually highest during the morning and evening rush hours when traffic congestion is at its peak. Industrial activities and other sources of pollution can also contribute to higher pollution levels during the day.
The highest temperature during the day can vary depending on location, weather conditions, and time of year. In general, the highest temperature is usually reached in the afternoon when solar radiation is at its peak.
Twitter updates instantly.
Highest casualties - Gettysburg (3-day battle) Highest casualties in one day - Antietam/Sharpsburg
Celebrities used Twitter to let their fans follow what they do day by day.
108 degrees