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A high-occupancy toll (HOT) is a toll enacted on single-occupant vehicles who wish to use lanes or entire roads that are designated for the use of high-occupancy vehicles (HOVs, also known as carpools). Tolls are collected either by manned toll booths, automatic number plate recognition, or electronic toll collection systems. High occupancy tolls are a form of road pricing.

The concept is an expansion of HOV lanes and an attempt to maximize their efficiency in moving vehicles. HOV lanes are designed to promote vehicle sharing and use of public transport by creating areas of lower road use as an incentive. Since some of these areas are under-used and therefore increase congestion, this has led to criticism of the scheme. HOT lanes are one answer to this. Since HOT lanes are often constructed within the existing road space there is much criticism of the idea, most commonly that HOT lanes are an environmental tax or perk for the rich. Among critics who view HOT lanes as a perk for the rich, HOT lanes are sometimes derided as "Lexus lanes".

HOT lanes are currently mostly confined to the United States. Canada and the United Kingdom are reported to be monitoring the success of this concept.

The following roads are among those currently using HOT Lanes:

• Interstate 15, San Diego, California, USA (SOV toll, HOV2+ free)
• 91 Express Lanes, Orange County, California, USA (SOV toll, HOV3+ discount/free off-peak)
• Interstate 394, MnPASS Minneapolis, Minnesota, USA (SOV toll, HOV2+ free)
• Interstate 15, Express Lanes between 600 N in Salt Lake City, Utah and University Parkway in Orem, Utah (SOV toll, HOV2+/clean-fuel free)
• Interstate 25, Express lanes between 20th Street in Downtown Denver and the US-36 interchange (SOV toll, HOV2+ free)
• Interstate 10 ("Katy Freeway"), Houston, Texas, USA (HOV2 toll/free off-peak, HOV3+ free, SOV prohibited)
• U.S. Highway 290 ("Northwest Freeway"), Houston, Texas, USA (HOV2 toll/free off-peak, HOV3+ free, SOV prohibited)

The following road is being reconfigured for HOT Lanes, which have not yet opened for toll-paying traffic

• Interstate 495 (Capital Beltway), between Springfield, Virginia, and the State Route 193 exit in McLean, Virginia. Officials of the Virginia Department of Transportation signed an agreement with two private companies in April, 2005. A contract was finalized on December 20th, 2007 and construction is to begin spring of 2008.^[1]

The following roads are among those being considered for HOT Lanes:

• In King County, Washington, USA:
  • Interstate 90
  • Interstate 405
  • SR 167 (project authorized to start, expected to open 2007-2008)
  • SR 520
• In Virginia, USA:
  • Interstate 95
  • Interstate 395
• In Maryland, USA:
  • Interstate 495 (Capital Beltway)
  • Interstate 270
  • Interstate 95
  • Baltimore Beltway (I-695)
• In South Carolina, USA:
  • Interstate 95
  • Interstate 26
• In Toronto, Ontario, Canada:
  • Don Valley Parkway
• In San Diego, California, USA:
  • Interstate 5
  • Interstate 805
• In San Francisco Bay Area, California, USA:
  • Interstate 680
• In San Antonio, Texas, USA:
  • Interstate 35
  • Loop 1604
• In Southeastern Pennsylvania, USA:
  • Interstate 76, Valley Forge to Philadelphia, via a proposed elevated deck on the Schuylkill Expressway.
• In Southern Florida
  • Interstate 95
  • State Road 836 (Dolphin Expressway)
  • Interstate 75 in Florida
• In Hoboken, NJ
  • NJ 495 approach to Lincoln Tunnel (helix)
• In Australia
  • Sydney Harbour Bridge Bus Lanes

• Express toll lane

• Washington State paper on HOT Lanes
• RPPI paper on HOT Lanes
• Brookings Institution economic study on HOT Lanes
• A Guide for HOT Lane Development (FHWA, 2003)
• Virginia Department of Transportation press release on Beltway HOT lanes, April 29, 2005
• Miami Herald article on HOT lanes
• Miami-Dade Expressway Authority Managed Lanes
• Atlanta Journal-Constitution article on HOT lanes