transponder
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GC: n

CT: Welcome to E-ZPass MA, Massachusetts Department of Transportation Electronic Toll Collection Program. E-ZPass is operational on the entire Massachusetts Turnpike including the Sumner and Ted Williams Tunnels, and on the Tobin Memorial Bridge. Where can I use E-ZPass?
E-ZPass provides customers with electronic toll collection through the use of a transponder. A transponder is a small electronic device that attaches to the inside of your windshield. As you pass through a designated lane, a green “Thank You” light will flash to verify your transaction is being approved and recorded to your account.

S: MDT – http://www.massdot.state.ma.us/highway/TrafficTravelResources/EZPassMAProgram.aspx (last access: 12 December 2014)

N: 1. 1945, from trans(mit) + (res)pond + agent noun suffix -er.
2. Emitter-receiver device that responds automatically to a radar, radio or sonar signal and allows a vehicle to be located, identified and guided.
3. Automatic vehicle identification transponders include probe vehicles, electronic tags (i.e. transponders), roadside antennas, roadside readers, and a central computing facility. See our Telecommunications Diagram on Vehicle-based Traffic Surveillance Using Tags for more information.
Probe vehicles are equipped with electronic tags that can track the vehicle’s speed, location, and travel time along roadways that have a tag reader infrastructure.

S: 1. OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=transponder&searchmode=none (last access: 12 December 2014). 2. GDT. 3. http://fresno.ts.odu.edu/newitsd/ITS_Serv_Tech/traff_surv/traffic_surveillance_vehicle_based_transponder_summary.html (last access: 12 December 2014).

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CR: computer science, intelligent system.