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US-23 Flex Route Phase 2 Project

Phase 2 of the US-23 Flex Route from south of M-36 to I-96 involves widening the median shoulder of northbound and southbound US-23 for the Flex Lane extension, ITS, two-course mill and resurface with reconstruction in select areas, interchange reconstruction at M-36 and Silver Lake Road, bridge replacement / widenings, signing and lighting.

Hennessey Engineers project managers (from newly acquired Access Engineering, Inc., Oct. 2023) prepared the Maintenance of Traffic (MOT) plans for this project. Extensive MOT design was required to coordinate the bridge and road work on this project. The MOT plans included the design of temporary pavement / widening and median crossovers. The project was complicated by the need to maintain two lanes in each direction of US-23 during daytime hours. Hennessey Engineers continues to provide as-needed design assistance during construction of this project.

Safety Benefit: MDOT completed a performance and safety study to formally examine the first phase of the flex route from M-14 to north of 8 Mile Road. The study found that significant safey improvements are expected by extending the US-23 Flex Route to I-96. MDOT anticipates that overall crashes will be reduced by 34 percent with the implementation of the flex route system along the US-23 corridor.

Transportation Engineering Transportation Engineering

Key Facts
  • Hennessey Engineers prepared MOT plans for US-23 Flex Route Phase 2 Project.
  • Required extensive MOT design to coordinate bridge and road work, and included design of temporary pavement / widening and media crossovers.
  • Two lanes needed to be open in each direction on US-23 during peak hours.
  • Hennessey Engineers provides as-needed design assistance during construction.
  • Owner: Michigan Department of Transportation

HNTB Michigan, Inc.


Livingston County

Project Date


Project Costs