The Arizona Department of Transportation said drivers on Ina Road and I-10 may experience delays beginning his week as crews improve frontage roads and prepare for major projects.

The work includes a new bridge and interchange for Ina over the Union Pacific railroad tracks, plus widening I-10 and Ina northwest of Tucson.

Some early projects include overnight utility work that narrows I-10 eastbound to one lane from Cortaro Road to Ina Road between 8 p.m. Wednesday and 5 a.m. Thursday. The eastbound I-10 Ina off-ramp will be closed during this time. Westbound I-10 will be closed except for one lane between Orange Grove Road and Ina Road from 8 p.m. Thursday to 5 a.m. Friday, with the westbound I-10 off-ramp at Ina closed.

Ina Road will be narrowed to one lane in each direction between the railroad tracks and Camino de la Cruz, a quarter mile to the east, on Wednesday and Thursday nights, as well as other nights through July 22 so crews can remove and repave the center median islands.

By the end of this month, the westbound frontage road will close for the rest of 2016 while crews widen and improve it to handle westbound I-10 traffic when freeway construction begins early next year. Ina Road will be reduced to one lane in each direction during much of this time. Alternate routes include Cortaro Road to the north of Ina and Orange Grove Road to the south.