LEHI — The Utah Department of Transportation has pared to five the number of options for a long-term freeway-usage plan in Utah County.

The department began with 21 options just over a year ago.

"We've considered everything you can possibly imagine — and some stuff that might go beyond," said Merrell Jolley, UDOT project manager for the I-15 South Project.

The first alternative would be to stop all new construction after high occupancy vehicle lanes on I-15 between Lehi and Orem are completed. Crews are now working on those lanes.

The second option — called Transportation Systems Management — would also stop new construction with the HOV lanes. However, the option would call for ramp meters and a bus rapid transit system to better use the existing I-15 infrastructure.

Options No. 3 through No. 5 include widening I-15 by as much as two lanes in some areas. Any of those options would also include aspects of the No. 2 option, such as ramp meters.

Option No. 3 includes only widening the freeway; option No. 4 would widen it and include a commuter rail line that would terminate in downtown Provo — a change from initial plans that had the line ending in Payson. Option No. 5 would widen the freeway and create a bus rapid transit system in a dedicated lane.

The widening plan would extend the stretch between Draper and the University Parkway exit in Orem to six lanes. (The present HOV project will create four lanes.)

Then, the freeway would go from three to five lanes from University Parkway to Mapleton, from two to four lanes between Mapleton and Spanish Fork, and from two to three lanes between Spanish Fork and Payson.

UTA already owns the right-of-way to put a commuter rail line on the west side of I-15 from Draper to Provo and has also favorably reviewed the buses that would be used in a bus-rapid transit system, which are designed to look similar to commuter rail cars.

Jolley said UDOT is still about a year away from a final recommendation.

The environmental impact survey, which has been going for just over a year, will need another 2 1/2 years to complete.

"As we evaluate both the environmental impacts and the financial impacts of each option, we'll make a decision that makes sense not only for Utah Valley, but for Salt Lake as well," Jolley said.

Jolley emphasized that a number of factors could still influence which option will be chosen or could require UDOT to come up with another option.

One of those factors is the Mountain View Corridor Project, another UDOT undertaking that will create a north-south thoroughfare reaching from I-80 on the west side of Salt Lake City to as far south as the shores of Utah Lake in Utah County.