Motorists traveling through Iowa this holiday weekend will encounter plenty of road construction. Mark Bortle, with the Department of Transportation, says some of the biggest projects are on Interstate-35. In central Iowa, northbound I-35 is reduced to one lane at the Ellsworth interchange for bridge repairs.

"Also, on I-35 in northern Iowa, from milepost 172 to 175, (northbound) traffic will be restricted to a single lane for asphalt resurfacing," Bortle said. In southern Iowa, pavement replacement projects have reduced traffic to single lanes in both direction of I-35 through much of Warren County.

Near Osceola, I-35 traffic is placed in a head-to-head pattern. Construction projects will also slow traffic heading in east or westbound directions. "We have a number of projects across I-80," Bortle said.

"In western Iowa, at both the Adair and Atlantic interchanges, we have traffic head-to-head to facilitate bridge replacement." In eastern Iowa, lanes and shoulders are narrowed on I-80 near Iowa City for pavement reconstruction and traffic is shifted for replacement of the I-80 bridges spanning the Cedar River.

Bortle says eastbound I-80 over the Mississippi River at Le Claire remains closed for bridge repairs. A number of projects will also slow traffic on Interstate-29 in western Iowa. All of the construction projects affecting traffic on state, county and local road systems can be viewed online  here .