Creating a 50-year intersection for the safety of road users and pedestrians.

Higley Road and Baseline Road were six-lane arterials with single left-turn lanes on all legs. Dedicated right-turn lanes existed on all legs with exception to eastbound Baseline Road. A traffic impact assessment for the proposed City Gate development on the southeast corner of the intersection recommended installing dual left-turn lanes on Higley Road to mitigate additional traffic volumes anticipated to be generated by the development. To create a 50-year intersection, the Town selected to install dual left-turn and dedicated right-turn lanes on all legs.

During the development of a Project Assessment, the Town of Gilbert (Town) was presented with two widening alternatives: 1) symmetrical widening about the roadway centerline, and 2) asymmetrical widening to the northwest to mitigate impacts to utilities and improvements from the recent ST146 project. Based on reasons discussed in the Project Assessment, the Town selected to proceed to final design with the asymmetrical option. Roadway drainage, traffic signals, roadway lighting, signing and marking, and landscape and irrigation within the project limits were relocated or replaced.

In addition to the improvements at the Higley Road and Baseline Road intersection, an eastbound dedicated right-turn lane and traffic signal were installed at the intersection of Baseline Road and San Benito Drive. The traffic signal at Higley Road and Baseline Road was relocated to accommodate the new alignment of the curb and sidewalk.

Dibble designed roadway and drainage improvements at the intersection to the full major arterial standards on all legs. The improvements included new curb, gutter, sidewalk, landscaped medians, sewer, Roosevelt Water Conservation District (RWCD) waterline relocations, street lighting, and traffic signals. Dibble successfully coordinated with utility companies, including RWCD and the Salt River Project (SRP). Our team also provided supplemental topographic survey, legal descriptions, and signing and marking design.

Project Lifecycle