Traffic is all the vehicles moving, or failing to move, on a road. Brake lights as far as you can see.
The word is a mass noun, so there is a lot of traffic rather than many traffics. It comes with its own furniture: traffic lights, a traffic jam, a traffic warden, the traffic news on the radio. It also covers movement of other kinds — air traffic, and the traffic to a website. There is a much darker sense as well, since trafficking means trading illegally in drugs, weapons or people.
1nountrafficVehicles moving along a road, taken together.~55%
“We sat in traffic for an hour.”
2nounmovementThe movement of aircraft, data or people through a system.~43%
“The site handles heavy traffic in the evenings.”
3verbtradeTo trade in something illegally.~2%
“They were convicted of trafficking in stolen goods.”
Shares are an estimate: a language model read 16 sentences found in the wild and placed 16 of them on a sense — a count of our sample, not a measurement of English.
Traffic was trade before it was congestion. Italian trafficare meant to carry on trade, and one suggestion takes it back to a Latin phrase meaning to rub across. Vehicles are a very late arrival.
tl
trapik
Arabic
تَفْرِيق — distribution, dispersion
Vulgar Latin
*trānsfrīcāre — to rub across
Italian
traffico — traffic
Middle French
trafique
English, today
traffic
Built from
From Middle French trafique, traffique (“traffic”), from Italian traffico (“traffic”) from trafficare (“to carry on trade”). Potentially from Vulgar Latin trānsfrīcāre (“to rub across”); Klein instead suggests the Italian has ultimate origin in Arabic تَفْرِيق (“distribution, dispersion”), reshaped to match the native prefix tra- (“trans-”). The adjectival sense is possibly influenced by tl trapik and follows a general trend in Philippine English to construct a noun from an adjective.
Etymology from Wiktionary, CC BY-SA