The highway headache in west Tulsa has only just begun. As part of a project to widen Interstate 44 from west of the Arkansas River to Union Avenue, and to improve the I-44/U.S. 75 interchange, significant delays can be expected, especially during peak travel times. “It’s definitely the hard part of the project right now,” Oklahoma Department of Transportation spokeswoman Kenna Mitchell said Tuesday. “They’re going to be placing some additional signage further back in the corridor to alert drivers.” Northbound U.S. 75 is narrowed to one lane at the interchange, causing northbound traffic to back up at least two...