Summary of Road Safety Assessment – State Route 431 Mount Rose Highway

The following includes the executive summary and suggestions for safety improvements to Mt. Rose Highway based on the road safety audit (RSA) conducted in July 2016.   This post is long, but I think necessary to relay all salient information contained in the Final Report. Summary of Road Safety Audit Conducted on Mt. Rose Highway – July 2018

A Community Information Meeting with NDOT will be held on Wednesday December 5 at 6 PM at the South Valleys Library.  Please plan to attend and make your voice heard.

EXECUTIVE SUMMARY

The Nevada Department of Transportation (NDOT) Traffic Safety Engineering Division authorized a Road Safety Assessment (RSA) to be conducted on Mount Rose Highway State Route 431 (SR 431) from Washoe County milepost (WA MP) 18.694 to WA MP 23.050. in Washoe County, Nevada. The RSA for this section of roadway conducted a before and after comparison of crash data due to a construction project that occurred in 2014. The purpose of this RSA is to identify potential road safety issues and suggest potential countermeasures for SR 431 to mitigate those safety issues for inclusion in future projects along the corridor, as well as identifying specific short, mid, or long-term suggestions for the corridor. The RSA Team included three participants that live on the corridor and drive it daily. One of the three participants is also an agency representative.

Between WA MP 18.69 and approximately WA MP 19.00, SR 431 consists of one lane in each direction with a center two-way left-turn lane (TWLTL). From WA MP 19.00 traveling northwest along the study corridor through WA MP 23.05, SR 431 consists of two lanes in each direction with a center TWLTL. Three NDOT Annual Average Daily Traffic (AADT) count stations are located along this section of SR 431. An overall increase in AADT was observed from 2015 to 2017 along the corridor.

There was a total of 49 crashes over the three-year period (2015-2017) along SR 431, of which two were incapacitating injury crashes. Both incapacitating injury crashes were non-collision and one involved a motorcycle. There were no fatal crashes within the dataset obtained from NDOT but there was an angle fatal crash on an uncontrolled left turn that occurred at the Callahan Road intersection on May 5, 2018.

SR 431 is identified as a “Urban Minor Arterial” by the functional classification for the State of Nevada. The injury crash rate for the corridor was found to be 0.22 crashes per million vehicle miles traveled (MVMT) as compared to the state average of 1.27 injury crashes per MVMT for the urban minor arterial functional classification. The fatal crash rate for the corridor was 0.00 crashes per MVMT as compared to the state average of 0.01 fatal crashes per MVMT. However, considering the fatal crash that occurred in 2018, the fatal crash rate would be above the state average. The total crash rate along the corridor was lower than the statewide average for the respective functional classification.

The RSA Team evaluated the crash history and existing conditions in the field to make specific suggestions to mitigate the issues, particularly the high number of non-collision crashes and the angle crashes for uncontrolled lefts from SR 431 and/or the side streets. The RSA Team’s suggestions for mitigation focused on intersection improvements to improve safety for uncontrolled left turns, on and off side streets, which included geometric improvements, updates to signage and striping and installation of lighting at the site of the fatal crash at Callahan Road and at sites with similar conditions. Suggestions for mitigation are divided into different priorities, Priority 1 improvements are near term., Priority 2 are intermediate improvements, and Priority 3 are long term improvements.

The suggestions stated in the RSA report could be considered in future planning for this corridor and may be implemented based on funding availability. A Priority 1 suggestion that is not able to be implemented in the near term should be considered for implementation with the Priority 2 suggestions. Similarly, Priority 2 suggestions not incorporated into upcoming Priority 2 projects should be considered with Priority 3 suggestions. The issues and suggestions for SR 431 are summarized below.

SUMMARY OF SUGGESTIONS

A summary of all suggestions for SR 431 are numbered in the following section based on priority. Priority 1: is defined as those suggested improvements that can be done in the near future by NDOT District II agency maintenance staff during their periodic maintenance as appropriate funding is available, unless otherwise noted.

Priority 2: is defined as those suggestions that will require some engineering design or those suggestions typical to Priority 1 improvements being completed as part of future NDOT roadway projects.

Priority 3: is defined as those long-term recommendations that will require significant engineering design and/or right-of-way acquisition and are to be considered for a future NDOT roadway improvement project if funding is available.

An “A” at the end of the priority indicates that it is a suggestion for the Regional Transportation Commission (RTC) Washoe and a “B” at the end of the priority indicates that it is a suggestion for Washoe County.

PRIORITY 1

Suggested improvements that can be done in the near future by NDOT District II agency maintenance staff during their periodic maintenance.

Entire Corridor

Priority 1: Add additional speed limit signs after the major cross streets.

Priority 1: Add dynamic message sign (DMS) warning system package for speed and congestion warning throughout the corridor. For example, at the intersections of SR 431 and Callahan Road and SR 431 and Edmonton Drive.

SR 431 at WA MP 19.5

Priority 1: Coordinate with Washoe County to deenergize the traffic signal heads and remove or bag them. A letter was sent from NDOT District II to Washoe County Community Development on July 19, 2018.

SR 431 at Callahan Road

Priority 1: Extend the westbound to southbound left turn lane striping closer to the center of the intersection. Look at reflective posts behind the radius.

SR 431 at WA MP 21.0

Priority 1: Consult with NDOT Transportation Multimodal Planning to determine if a bike crossing should be provided at this location or in another area.

SR 431 at WA MP 22.0

Priority 1: Remove vegetation covering sidewalk.

SR 431 at Edmonton Drive

Priority 1: Install a speed limit sign for eastbound traffic west of the intersection.

SR 431 at WA MP 23.0

Priority 1: Provide directional signage in advance of Wedge Parkway, so bicyclists can choose to make the left turn and ride on the path (if desired).

PRIORITY 2

Suggested improvements that should be considered by NDOT for inclusion in upcoming projects if funding is available. Priority 1 suggestions should also be considered for implementation with Priority 2 suggestions if they have not already been implemented as a result of funding or other considerations.

Entire Corridor

Priority 2: Replace HPS lights with LED lights.

Priority 2: NDOT to coordinate with Washoe County on access management and the installation of snowplow friendly raised median islands throughout the corridor for cross roads and driveways. Consider limiting uncontrolled left turns from the side streets where feasible. If median islands are installed provide ramped median noses and yellow raised pavement markings and/or plastic delineator posts on top of the curb for the median islands per NDOT Standard Plan T-38.1.5.

Priority 2B (Washoe County): Washoe County to consider access management for developments along the corridor.

Priority 2: Consider the use of alternative pavement markings to improve delineation of the bicycle lanes near right turn lanes.

Priority 2: Restripe the bike lane through the intersection.

SR 431 at WA MP 19.5

Priority 2: Remove the emergency signal.

SR 431 at Callahan Road

Priority 2: Restripe the intersection and relocate the stop bars closer to the through lanes. Add snowplow friendly median islands and/or right turn channelizing islands, if feasible. Consider snowplows in the design.

Priority 2: Consider the feasibility of extending the eastbound to southbound right turn lane.

Priority 2: Implement the results of the ICE Analysis.

Priority 2: Install two additional LED luminaires.

SR 431 at WA MP 21.0 at Fawn Lane

Priority 2: Consider the feasibility to extend the eastbound acceleration lane.

Priority 2: Consider the feasibility to extend the eastbound to southbound right turn lane.

SR 431 at WA MP 21.0 at Fawn Lane

Priority 2: Install additional lighting at the intersection.

SR 431 at Thomas Creek Road

Priority 2: Provide a landing and pathway to the crosswalk on the west leg of the intersection. Review adjacent development as it was mentioned that new development could restrict pedestrian access.

Priority 2: Consider the feasibility to extend the westbound acceleration lane.

Priority 2: Consider the feasibility to extend the westbound to northbound right turn lane.

Priority 2: Consider reconstructing the curb ramps and restriping the crosswalk to move the stop bar up.

Priority 2A (RTC): Review traffic responsive timing for eastbound to northbound left turn. It was noted that the advance signal flasher for westbound through traffic impacts the traffic responsive operation. Study the intersection traffic volumes to determine if the signal can be upgraded to flashing yellow arrow by time of day. Upgrade signal heads to have retroreflective backplates.

SR 431 at Edmonton Drive

Priority 2: Restripe the intersection and relocate the stop bar closer to the through lane. Add snowplow friendly median islands, if feasible. Consider snowplows in the design.

Priority 2: Consider the feasibility to extend the eastbound acceleration lane.

Priority 2: Consider the feasibility to extend the eastbound to southbound right turn lane.

Priority 2: Consider. the use of High Friction Surface Treatment (HFST) on the south leg of the intersection.

Priority 2: Consider the need for intersection warning signs for the eastbound approach.

Priority 2: Install additional lighting at the intersection.

SR 431 at Telluride Drive

Priority 2: Restripe the intersection and relocate the stop bar closer to the through lanes. Add snowplow friendly median islands, if feasible. Consider snowplows in the design.

Priority 2: Consider the feasibility to extend the westbound acceleration lane.

Priority 2: Consider the feasibility to extend the westbound to northbound right turn lane.

SR 431 between Edmonton Drive and Sundance Drive/De Spain Lane

Priority 2: Evaluate a HAWK or other pedestrian treatment per the NDOT Pedestrian Safety Improvement Evaluation Guidelines for Uncontrolled Crossings.

SR 431 at Sundance Drive/De Spain Lane

Priority 2: Restripe the intersection and relocate the stop bar closer to the through lanes. Add snowplow friendly median islands, if feasible. Consider snowplows in the design.

Priority 2: Consider the feasibility to extend the westbound acceleration lane.

Priority 2: Consider the feasibility to extend the westbound to northbound

PRIORITY 3

Suggested Improvements that should be considered by NDOT as those long-term recommendations which will require significant engineering design and/or right-of-way acquisition and are to be considered for a future NDOT roadway improvement project if funding is available.

Entire Corridor

Priority 3: Review the intersections along the corridor and provide additional lighting, if needed, per the NDOT Signal, Lighting, and ITS Design Guide Section 5.2.6 Safety Lighting.

Priority 3: Remove the existing rumble strips and re-install rumble strips per NDOT standard R-10.1.7.

SR 431 at WA MP 20.0 – 20.5

Priority 3: Remove the existing southbound to eastbound left turn movement at Callahan Road and provide an unsignalized High-T intersection at Callahan Road. Coordinate with Washoe County to provide access from Paris Court to Mountain Ranch Road and provide an unsignalized High-T intersection at Mountain Ranch Road to provide the ability for motorists living north of SR 431 to head east.

SR 431 at WA MP 21.0 at Fawn Lane

Priority 3: Consider the reconstruction of the intersection as an unsignalized High-T intersection.

SR 431 at Edmonton Drive

Priority 3: Coordinate with Washoe County to evaluate the feasibility of adding a fourth leg to the intersection of Thomas Creek Road and provide an access road to the intersection of Butch Cassidy Drive and Edmonton Drive to relocate turning movements to the signalized intersection and make Edmonton Drive a right-in/right-out intersection.

Priority 3: Consider cutting the slope to improve sight visibility.

Priority 3: Extend the left turn lane and remove the rumble strips that form the taper on the left turn lane.

Priority 3: Reconstruct the intersection as an unsignalized High-T intersection with channelized islands. Consider snowplows in the design. Add intersection

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