E-Z Pass Electronic toll collection system that is common in the Northeast U.S., based in New Jersey.
HowStuffWorks: How E-ZPass Works Fully illustrated tutorial explains E-Zpass, an electronic toll-collection system consisting of a 900-MHz band car transponder, antenna, lane controller, LAN and host computer system.
M-TAG Electronic toll collection system for bridges and tunnels in Baltimore, Maryland, U.S.
Roam Electronic toll collection system used around Sydney, Australia, including on the M7. Includes e-TAG and e-PASS transponder information.
MACPASS - Automated Toll Collection System Service available for crossing of various bridges in the Maritime Provinces of Canada. Site includes FAQ, price information, and application forms.
Halifax-Dartmouth Bridge Commission Authority for the Angus L. Macdonald and A. Murray MacKay Bridges that connect Halifax to Dartmouth in Nova Scotia, Canada.