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The Utah Transit Authority announced Wednesday how it plans to spend some extra sales-tax money that residents in Weber and Davis counties approved last year through Proposition 1.

The agency said the three-year plan announced on its website includes a 38 percent increase in bus service.

Improvements in Davis and Weber counties include:

• 72,620 additional bus service hours annually.

• Two new bus routes.

• Six routes with longer spans of service, bringing 13,760 hours annually of either earlier or later service.

• Two routes with added peak-hour service.

• An 18 percent increase in weekend service including four routes with new Saturday service, four routes with improved Saturday frequency and three routes with improved Sunday frequency.

More details are available online at rideuta.com.

The agency said other enhanced service investments include 18 new buses including five ski buses, four trolleys and nine regular buses.

Additionally, $3 million in shelters, sidewalks and trails will be added to serve riders between now and 2018. Bike amenities also will be improved at certain bus stops.

UTA plans several open houses to discuss the plans in coming weeks. Those meeting include:

• North Salt Lake City Hall, March 24, 4:30 p.m.-6:30 p.m.

• Ogden Transit Center, March 31, 4:30 p.m.-6:30 p.m.

• North Temple Station, April 7, 4:30 p.m.-6:30 p.m.

• Clearfield Station, April 19, 3:30 p.m.-5:30 p.m.

• Layton Library, April 21, 4:30 p.m.-6:30 p.m.