As a subconsultant to Y2K Engineering, MTJ was retained to address delay, queuing, and vehicular and pedestrian safety concerns and issues. The purpose of the study was to evaluate the existing conditions and identify strategies to support improved operations and safety for all modes at this existing roundabout for future traffic.

MTJ reviewed the existing roundabout’s operations and safety record, resulting in the identification of opportunities for improving operational performance and safety for all modes – to include signing, markings, geometrics, and other potential mitigation techniques.

MTJ’s work effort included:

Review & documentation of roundabout-specific safety principles

Crash and speed data analysis, including a summary of how this roundabout compares to national crash rates

Capacity analysis focused on design techniques to improve operational performance for the side streets

Pedestrian safety and accommodation techniques discussion

Recommendations/alternatives to improve operations & safety

Recommendations included:

Pavement marking and signing modifications

Operational improvements

Pedestrian safety and accessibility enhancements

Speed management techniques

ACEC Arizona

“Engineering Excellence”

2011

MTJ Engineering designed this award-winning roundabout as part of a corridor redevelopment project. Award: ACEC Arizona “Engineering Excellence” 2011.

The roundabout provides traffic calming through the neighborhood, and its landscaping includes an inscribed circle with native plantings.

MTJ provided the capacity analysis and final horizontal design for this urban, multi-lane roundabout. MTJ’s foundational geometric elements achieved capacity objectives, while maintaining essential design elements that promote safety for all modes – vehicular, pedestrian, and cyclists.

This urban roundabout serves as a gateway to a residential neighborhood and provides traffic calming for the neighborhood. The landscaping includes an inscribed circle with native plantings.