consultant – n. a person who gives professional advice or services to companies for a fee

vendor – n. a person who sells things, especially in the street

congestion – n. A state of being too full or crowded with something such as traffic or people

emissions – n. act of producing or sending something out (such as energy or gas)

commuters – n. people who travel from one place to another regularly, such as to their place of work

gridlock – n. when the streets are so full that vehicles cannot move