The term "congestion charge" refers to a fee charged to drivers in urban areas to reduce traffic and improve air quality. There are several synonyms for this term, including "road pricing," "toll charge," "congestion fee," "pollution charge," and "traffic reduction charge." These terms are often used interchangeably, but they all refer to the same concept of charging drivers to enter certain areas during peak traffic hours. The use of congestion charges has become increasingly popular in major cities around the world as a way to alleviate traffic congestion and promote sustainable transportation options.