DENVER -- By the end of the year those H-O-V lanes on Interstate 25 will become H-O-T lanes.

H-O-T stands for high occupancy toll, as opposed to high occupancy vehicle. The lanes will allow single drivers to use the express lanes for a fee.

The framework to hold the electronic scanners has been installed. Next comes the computer system and work on an enforcement zone.

The Colorado Department of Transportation has already come up with a sliding fee schedule. Prices will vary from 50 cents during non-peak hours to a high of $3.25 during peak travel times.

"This will be all electronic toll collection. People will have to have transponders, the same technology being used on E-470 or the Northwest Parkway -- so they will be seamless among all those facilities. And no toll booths. We don't want anything to slow down traffic in those lanes," said CDOT spokeswoman Stacey Stegman.

CDOT hopes to convert highway lanes to high occupancy toll lanes by Dec. 1. Current plans call for carpoolers to use one of the lanes and single occupant toll payers to use the other.