The project will include a new roundabout at the intersection of Scottsdale Road and Dynamite Boulevard, funded by a $1.8 million federal Highway Safety Improvement Program (HSIP) grant.

Consistent with the City's Transportation Master Plan, this project will convert this section of Scottsdale Road to a complete street including updates to the major intersections, landscaped medians, bike lanes, sidewalks and trails to improve safety, capacity and accessibility for motor vehicles, bicycles and pedestrians. Existing signalized Dynamite Boulevard will be replaced with a multi lane roundabout.

This project will include the design of:

• 8-foot wide separated sidewalk on the west side
• 10-foot multi use path or 8-foot trail on the east side
• multilane roundabout at the intersection of Dynamite Boulevard
• High intensity activated crosswalk (HAWK) crossing at Pinnacle Vista Drive
• 150-foot of right of way (targeted)
• Eliminate wet crossings

During the design process several meetings were held with homeowners association's in the area and a public meeting was held with the community. Please see the information that was presented at the last meeting in the box below.

Will the speed limit on Scottsdale Road change?

On Scottsdale Road the speed limit will remain 50 mph which is the current posted speed for most of the corridor. Within the Dynamite Road roundabout and all approaches, the speed limit will be reduced to 20 mph.

What are the traffic volumes on Scottsdale Road?

2019 Traffic volumes on Scottsdale Road between Jomax and Dynamite are 30,600 vehicles per day and between Dynamite and Dixileta are 27,200 vehicles per day. 2025 projected volumes for Jomax to Dynamite are 31,800 vehicles per day and for Dynamite to Dixileta are 28,600 vehicles per day.

Has the city considered using rubberized asphalt to minimize road noise?

The City's Public Works Division performed a noise study comparing rubberized and conventional asphalt and determined that there were no noticeable differences in noise abatement. Because rubberized asphalt costs significantly more than conventional asphalt and deteriorates approximately twice as fast, Scottsdale no longer uses it.

Will there be raised median islands on Scottsdale Road?

Yes, a raised landscaped median island will be constructed on Scottsdale Road, with openings at cross street intersections and property access points.

What will the design do to improve drainage in the area?

All of the at roadway grade wash crossings within this projects’ limits will be eliminated on Scottsdale Road. Scottsdale Road will have a pass-through drainage design for the regional flows at crossing locations. The peak storm flows will be collected in a swale on the east side of the roadway and directed to various culverts crossing beneath Scottsdale Road in their historic patterns.

What types of sidewalks and trails will be built?

The Scottsdale Road project will construct a new detached 8-foot concrete sidewalk on the west of the road and a new 10-foot concrete shared-use path on the east side of the road. Unpaved trails are also planned for the east and west sides of the roadway, which should be constructed shortly following the roadway improvements. The sidewalks, paths, and trails are consistent with other corridors in this part of the city and consistent with the city's complete streets policy, which encourages multi-modal transportation.

What types of bike lanes will be built?

A 5-foot bike lane is being constructed as part of the Scottsdale Road project that is consistent with city design and policy standards. The project will also install a detached 8-foot concrete sidewalk on the west of the road and a new 10-foot concrete shared-use path on the east side of the road.

Will there be a wall or sound barrier installed along Scottsdale Road, and what would the wall look like?

The results of the noise analysis indicated that future noise levels as a result of the improvements and increased traffic volumes will not meet the threshold for mitigation, therefore, sound barrier walls along Scottsdale Road are not warranted. Existing walls not in conflict with proposed improvements will be protected in place. Walls that do conflict with proposed improvements will be relocated, with the same height, aesthetics, finish, and color, beyond the conflict.

What does the City use for criteria when identifying suitable roadways for roundabouts?

Per the City of Scottsdale’s Transportation Policy, a roundabout design must be included in the alternatives analysis of any proposed intersection improvements or modifications and must be the primary option explored for feasibility. Traffic volumes, patterns, and speed are considered when deciding the best configuration for an intersection. Roundabouts are often a good option to improve safety, reduce or remove serious or fatal traffic accidents, and increase traffic flow & capacity when there's a relatively moderate, balanced volume of traffic among all approaches to the intersection.

What criteria indicated a roundabout should be installed at Dynamite?

A recent history of fatal and serious injury accidents was a key consideration at this intersection. The city also considers criteria such as traffic capacity analyses, right-of-way acquisition, overall safety (vehicular, bicycle, pedestrian) and roundabout geometrics when evaluating whether to implement a roundabout. The roundabout at Dynamite Road was found to satisfy these considerations and was determined to be the preferred alternative.

Can roundabouts accommodate larger vehicles and trucks?

Yes, the roundabouts are designed to accommodate larger vehicles and trucks, such as tractor trailers.

How long will construction take?

Utility relocations began mid-2024.  Construction will begin in November 2024 and will be complete in the summer of 2026.

Will the roads be closed during construction?

In general, a minimum of one lane of traffic in each direction will be open during construction. No long-term road closures are anticipated; however, short closures may be necessary to reconfigure traffic control and protect worker and public safety during project construction.