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Nevada 2007 Five Percent Report

This report is in response to the Federal requirement that each state describe at least 5 percent of its locations currently exhibiting the most severe highway safety needs, in accordance with Sections 148(c)(1)(D) and 148(g)(3)(A), of Title 23, United States Code. Each state's report is to include potential remedies to the hazardous locations identified; estimated costs of the remedies; and impediments to implementation of the remedies other than costs. The reports included on this web site represent a variety of methods utilized and various degrees of road coverage. Therefore, this report cannot be compared with the other reports included on this Web site.

Protection from Discovery and Admission into Evidence—Under 23 U.S.C. 148(g)(4) information collected or compiled for any purpose directly relating to this report shall not be subject to discovery or admitted into evidence in a Federal or State court proceeding or considered for other purposes in any action for damages arising from any occurrence at a location identified or addressed in the reports.

Additional information, including the specific legislative requirements, can be found in the guidance provided by the Federal Highway Administration,
http://safety.fhwa.dot.gov/safetealu/fiveguidance.htm.


5% Report - Nevada Division

Section 148(c)(1)(D) requires States to annually submit a report that describes not less than 5 percent of location exhibiting the most severe safety needs. Because Nevada has significant urban population centers in Las Vegas and Reno-Sparks-Carson City and vast rural areas with very different safety needs it was decided that NDOT would produce an urban 5 percent list and a separate rural 5 percent list.

The development of this report employed 2003-2006 crash data collected using the revised, MMUCC compliant, crash report form. Spatial analyses were used for both the urban and rural analyses.

The urban analysis utilized the most recent HCL data list using 2004-2006 crash data. This data was filtered so that only fatal and injury crash data was used at locations within urban boundaries.

Routes Analyzed

The routes that were included in the rural 5 Percent analysis were all public Roads in Nevada where crashes occurred outside urban boundaries. The total statewide mileage of these routes is 5352 miles.

The total mileage of the Top Ten Segments was 137 Miles.

Methodology Used to Identify Rural Locations

To identify the rural 5 Percent list our GIS was used to perform spatial analyses on all public roads outside urban areas. Four years of crash data (2003-2006) was applied to these roads for crashes involving only fatalities, type A injuries (the most severe type), and type B injuries. PDO and type C injury crashes were not used.

A sliding mile analysis was applied, counting crashes and performing calculations to find hotspots with various weighted crash densities greater than 5 weighted crashes per mile.

The weighted crash count was calculated as:

(# of fatal crashes *4) + (# of type A injury crashes *2) + (# of type B injury crashes) = Weighted Crash Count

A weighted crash rate based on crashes per mile was then calculated using the formula:

Weighted Crash Rate / Length of Route (miles).

A 5-mile buffer was then placed around each of the hotspots to develop contiguous segments. The contiguous segments were ranked by a weighted crash density (crashes per mile). From this ranking a list of the top roadways was developed and potential mitigations along with implementation costs. This list is included in Tables 3 - 4 and shown on Figures 4 - 7.

Urban Crash Data Summary

The top 5% High Crash Location Intersections used five years of data (2002-2006) and included only fatal and injury crashes. Property damage only (PDO) crashes were not used in identifying and ranking high crash locations. 895 locations were identified as high crash locations with the highest ranking 45 considered as the top 5%. . This data set contains 777 fatal crashes; 5,041 A injury crashes; and 20,335 B injury crashes.

Methodology Used to Identify Urban Locations

The urban analysis used a statewide GIS to focus on at-grade intersections in both Washoe and Clark Counties, where 87% of Nevadan's reside. Three years of crash data (2004-06) were used and crashes within 100 feet of each intersection were aggregated to the intersection. Those intersections with 30 or more crashes of any severity (1,309 intersections) were further analyzed using the following methodology:

Weighted Crash Count

Fatal Crash = 3.0
A Injury Crash = 1.5
B Injury Crash = 1.0

C Injury Crashes not used in analysis Fatal weighting was kept modest so as not to chase fatal crashes.

Weighted Fatality/Injury Count

This is a count of fatalities and all injuries (A,B,C). The fatality weighting was increased to 4 as all injury types are included.

Fatality = 4.0 Injury = 1.0

Population Weighting (100,000 pop per square mile)

Washoe County-
Population = 396,000
Urban area under analysis = 289. 2 square miles

3.96/289.2= 0.0137

Clark County-
Population = 1,777,000
Urban area under analysis = 520.4 square miles

17.77/520.4 = 0.0341

Raw weighting factor = 0.0137/0.0341= 0.401

The actual weighting factor used was half or 0.802 as the raw number had undue influence in the results. This factor was applied both to the weighted crash count and weighted fatality/injury count to create a weighted crash rate and weighted fatality/injury rate.

Identifying the top 5% urban intersections

Crash/Fatality and Injury rate was based on this final calculation:

Weighted crash rate * 0.7 + Weighted fatality/injury rate * 0.3

This calculation takes into consideration those locations that exhibited more fatalities and injuries per crash. Those HCL intersections with a Crash/Fatality and Injury rate greater than or equal to 5 yielded 895 locations, the top 45 considered as the top 5%.

Ranking the top 5% urban intersections

Final analysis of the top 5% ranked these intersections by applying an entering vehicle volume for each intersection. This permitted the following calculations:

  1. Injury crash rate per million entering vehicles=
    1. (Injury Crashes * 1,000,000)/(entering vehicles* three years * 365 days)
  2. Fatal crash rate per million entering vehicles=
    1. (Fatal Crashes * 1,000,000)/(entering vehicles* three years * 365 days)
  3. Severity Index=
    1. Injury Rate * 0.3 + Fatal Rate * 0.7 * 100

    Potential remedies, estimated costs and impediments to implementation are shown in this Table.

Figure 4: Rural 5 Percent Statewide Map

Figure 5: Rural 5% Inset Maps

Table 3: Top 5 Percent Rural Segments Weighted by Crash Density

5 Percent Rural Segments

TOP TEN SEGMENTS BY WEIGHTED CRASH RATE

Map ID County Route Length
(miles)
Crash
Count
(all severities)
Fatal
Crashes
A injuries
crashes*
B injuries
crashes**
Wt Crash
Count
Wt Crash
Rate
Begin MP End MP
1 Clark SR159 12.8 161 7 16 29 89 6.96 1.4 14.1
2 Douglas US50 5.1 114 2 6 12 32 6.25 7.0 12.2
3 Clark SR160 31.2 299 23 12 59 175 5.61 12.2 43.2
4 Washoe SR431 13.6 229 3 12 40 76 5.58 3.6 17.8
5 Clark IR15N 25.5 436 13 9 68 138 5.41 0.0 25.5
6 Clark IR15N 5.7 56 4 3 4 26 4.56 58.4 64.1
7 Douglas SR88 7.1 91 2 5 12 30 4.22 0.0 7.1
8 Carson City US50 6.1 143 2 4 8 24 3.95 0.0 6.0
9 Washoe IR80E 24.1 250 7 13 34 88 3.65 20.5 44.7
10 Douglas US395N 6.1 78 3 3 4 22 3.63 24.4 30.2

Comparison to Network

Totals Length
(miles)
Crash
Count
(all severities)
Fatal
Crashes
A injuries
crashes*
B injuries
crashes**
Wt Crash
Count
Wt Crash
Rate
Analyzed Rural Routes 6164 9885 272 485 1411 3469 0.56
Top 10 Segment 137 1857 66 83 270 700 5.10
Top Ten Segment % of Analyzed Routes 2% 19% 24% 17% 19% 20%  

*A Injury Crashes= When the highest injury severity is an A injury
**B Injury Crashes= When the highest injury severity is an B injury

Table 4: 5 Percent Rural Segments-Mitigation and Costs

Map ID Route County Begin Milepost End Milepost Injuries Fatalities Mitigation Cost Comments
1 SR159 Clark 1.4 14.1 90 9 Install shoulder rumble strip and centerline center rumble strip $20,000 Possible sound and bicycle concerns.
2 US50 Douglas 7.0 12.2 66 2 Install shoulder rumble strip and centerline center rumble strip $180,000 Possible sound and bicycle concerns.
3 SR160 Clark 12.2 43.2 168 23 Install guardrail, median rumble strip, lengthen truck climbing lane, construct vehicle turnout, restripe and lengthen turn pocket @ SR159 $343,000 Contract 3257 project complete
Widen roadway to add 4' inside shoulder and 8' outside shoulder $12,500,000 Contract 3312 project under construction
4 SR431 Washoe 3.6 17.8 132 3 Install shoulder rumble strip and centerline center rumble strip $200,000 Possible sound and bicycle concerns.
5 I-15 N Clark 0.0 25.5 328 18 Increase NHP enforcement $200,000  
6 I-15 N Clark 58.4 64.1 43 7 Install cable median barrier $1,700,000  
7 SR88 Douglas 0.0 7.1 73 2 Construct deceleration lane at Centerville, install speed limit signs on SR 88, NB $1,200,000  
8 US50 Carson City 0.0 6.0 61 2 Install shoulder rumble strips $100,000 Possible sound and bicycle concerns.
9 I-80 E Washoe 20.5 44.7 116 6 Increase NHP enforcement $200,000  
10 US395 N Douglas 24.4 30.2 45 3 Install cable median barrier  $1,700,000 Contract 3335 project under construction
Total  $18,343,000

Figure 6: Top 5% Urban High Crash Location Intersections

Table 5: Urban 5 Percent List
5% Overall Strategy

County Occurred On Street at Reference Street Injury
Crashes
Fatal
Crashes
Fatalities Main
ADT
Cross
ADT
Injury
Rate
Fatal
Rate
SEVERITY
INDEX
Clark SPRING MOUNTAIN RD @ CIMARRON RD 21 1 1 6385 950 2.61 0.12 87.15
Washoe ODDIE BLVD @ SULLIVAN LANE (C) 22 0 0 16800 6500 0.86 0.00 25.87
Clark E OWENS AV @ PECOS RD 20 3 3 7600 23100 0.59 0.09 24.10
Washoe ODDIE BLVD @ EL RANCHO DR 25 1 1 19500 18850 0.60 0.02 19.53
Clark N ARLINGTON ST @ CHARLESTON BLVD 23 1 1   37400 0.56 0.02 18.56
Clark JONES BLVD @ HACIENDA AVE 24 2 2 35150 9200 0.49 0.04 17.71
Clark SPRING MOUNTAIN RD @ JONES BLVD 35 2 2 22250 44600 0.48 0.03 16.26
Clark N BUFFALO DR @ CHEYENNE AVE 38 0 0 17000 50350 0.52 0.00 15.46
Clark S DURANGO DR @ SAHARA AVE 39 1 1 36550 37000 0.48 0.01 15.40
Clark S FORT APACHE RD @ SAHARA AVE 33 1 0 48800 17600 0.45 0.01 14.58
Clark E WASHINGTON AV @ PECOS RD 16 2 2 15750 23100 0.38 0.05 14.57
Clark E WASHINGTON AV @ NELLIS 25 1 1 7700 45150 0.43 0.02 14.17
Clark E WASHINGTON AV @ LAMB BLVD 22 2 2 10500 46250 0.35 0.03 12.87
Clark N LAMB BLVD @ CHARLESTON BLVD 42 1 1 47850 49300 0.39 0.01 12.50
Washoe MCCARRAN BLVD @ PYRAMID HWY 27 0 0 27500 31750 0.42 0.00 12.48
Clark N DECATUR BLVD @ SMOKE RANCH RD 24 0 0 36000 19300 0.40 0.00 11.89
Clark TROPICANA AVE @ CAMERON ST 24 0 0 50450 6200 0.39 0.00 11.61
Clark FLAMINGO RD @ TORREY PINES DR 26 0 0 55150 9850 0.37 0.00 10.96
Clark STEWART AV @ NELLIS 23 1 1 12950 51100 0.33 0.01 10.84
Clark TROPICANA AVE @ PARADISE RD 47 0 0 87700 32300 0.36 0.00 10.73
Clark FLAMINGO RD @ SPENCER ST 25 0 0 57750 12350 0.33 0.00 9.77
Clark FLAMINGO RD @ SWENSON ST 32 0 0 65150 25000 0.32 0.00 9.73
Clark MARYLAND PKWY @ KATIE AVE 20 2 2 70200   0.26 0.03 9.63
Clark E CHARLESTON BLVD @ EASTERN AVE 28 1 1 28800 58550 0.29 0.01 9.51
Clark MARYLAND PKWY @ SIERRA VISTA DR 25 0 0 73400   0.31 0.00 9.33
Clark S VALLEY VIEW BLVD @ SAHARA AVE 28 1 1 37050 53550 0.28 0.01 9.17
Clark DESERT INN RD @ JONES BLVD 25 1 1 45300 43050 0.26 0.01 8.48
Clark S DECATUR BLVD @ SAHARA AVE 34 0 0 62600 48400 0.28 0.00 8.39
Clark N LAMB BLVD @ LAKE MEAD BLVD 20 1 1 33400 40150 0.25 0.01 8.32
Clark FLAMINGO RD @ MARYLAND PKWY 33 2 2 61250 65500 0.24 0.01 8.14
Clark TROPICANA AVE @ JONES BLVD 28 1 1 65450 39600 0.24 0.01 7.91
Clark FLAMINGO RD @ KOVAL LN 26 2 2 81100 27600 0.22 0.02 7.73
Clark W CHARLESTON BLVD @ MAIN ST 24 0 0 52500 32800 0.26 0.00 7.71
Clark E CHARLESTON BLVD @ NELLIS 26 0 0 38300 58300 0.25 0.00 7.37
Clark TROPICANA AVE @ PECOS RD 28 0 0 70950 44300 0.22 0.00 6.66
Clark W SAHARA AV @ LAS VEGAS BLVD 29 0 0 91150 30500 0.22 0.00 6.53
Clark FLAMINGO RD @ EASTERN AVE 27 0 0 56250 57200 0.22 0.00 6.52
Clark LAS VEGAS BLVD @ TROPICANA AVE 35 0 0 51200 98650 0.21 0.00 6.40
Clark RAINBOW BLVD @ DESERT INN RD 17 3 3 60650 42800 0.15 0.03 6.36
Clark FLAMINGO RD @ DECATUR BLVD 23 2 2 65950 63800 0.16 0.01 5.84
Clark TROPICANA AVE @ DECATUR BLVD 26 0 0 70600 58700 0.18 0.00 5.51
Clark N MARTIN L KING BLVD @ BONANZA RD 25 0 0 77700 46900 0.18 0.00 5.50
Clark TROPICANA AVE @ SWENSON ST 20 1 1 76500 46300 0.15 0.01 4.98

Table 6: Urban 5 Percent Mitigations and Costs

SEVERITY
INDEX
County Occurred On Street at Reference Street Mitigation Implementation Cost COMMENTS
87.15 Clark SPRING MOUNTAIN RD @ CIMARRON RD Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not Programmed yet
25.87 Washoe ODDIE BLVD @ SULLIVAN LANE (C) Install protected left turn phase $200,000.00 Project to be completed in 2007
24.10 Clark E OWENS AV @ PECOS RD Install protected left turn phase $100,000.00 Project not programmed yet.
19.53 Washoe ODDIE BLVD @ EL RANCHO DR Install left turn  $200,000.00 Project to be completed in 2007
18.56 Clark N ARLINGTON ST @ CHARLESTON BLVD Install median island $80,000.00 Project completed in 2004
17.71 Clark JONES BLVD @ HACIENDA AVE Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not Programmed yet
16.26 Clark SPRING MOUNTAIN RD @ JONES BLVD Install protected left turn phase $800,000.00 Project not Programmed yet
15.46 Clark N BUFFALO DR @ CHEYENNE AVE Construct dual protected left turn lanes in the westbound and eastbound directions (Cheyenne) $275,000.00 This may be done by reconfiguring the striping (2003 meeting) Project not programmed yet
15.40 Clark S DURANGO DR @ SAHARA AVE Install protected left turns on Durango $100,000.00 Project not Programmed yet
14.58 Clark S FORT APACHE RD @ SAHARA AVE Install protected left turn phase $100,000.00 project not programmed yet.
14.57 Clark E WASHINGTON AV @ PECOS RD Install protected left turn phase on Pecos $100,000.00 Project not Programmed yet
14.17 Clark E WASHINGTON AV @ NELLIS Install protected left turn phase on Nellis $100,000.00 Project not Programmed yet
12.87 Clark E WASHINGTON AV @ LAMB BLVD Construct dual protected left turn lane on Lamb (North and South) $300,000.00 (Discussed at the 2004 meeting) Project not programmed yet.
12.50 Clark N LAMB BLVD @ CHARLESTON BLVD Install protected left turn phasing on Lamb $100,000.00 Project not Programmed yet
12.48 Washoe MCCARRAN BLVD @ PYRAMID HWY RTC Washoe County is working on this intersection $500,000.00 Commit Safety funds to project?
11.89 Clark N DECATUR BLVD @ SMOKE RANCH RD Install protected left turn phase $100,000.00 Project not programmed yet.
11.61 Clark TROPICANA AVE @ CAMERON ST Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not Programmed yet
10.96 Clark FLAMINGO RD @ TORREY PINES DR Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not Programmed yet
10.84 Clark STEWART AV @ NELLIS Install protected left turn phasing on Stewart $100,000.00 Project not Programmed yet
10.73 Clark TROPICANA AVE @ PARADISE RD Construct overhead signage and better lane delineation on SB Paradise $200,000.00 Project not Programmed yet
9.77 Clark FLAMINGO RD @ SPENCER ST Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not Programmed yet
9.73 Clark FLAMINGO RD @ SWENSON ST Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not Programmed yet
9.63 Clark MARYLAND PKWY @ KATIE AVE Split phase the east/west movement.  Roadway geometrics will not fit left turn pockets. $40,000.00 Project not Programmed yet
9.51 Clark E CHARLESTON BLVD @ EASTERN AVE Install protected left turn phasing in the eastbound dir on Charleston $60,000.00 Project not Programmed yet
9.33 Clark MARYLAND PKWY @ SIERRA VISTA DR Split phase the east/west movement.  Roadway geometrics will not fit left turn pockets. $40,000.00 Project not Programmed yet
9.17 Clark S VALLEY VIEW BLVD @ SAHARA AVE Construct longer turn pockets on Sahara $210,000.00 Increase storage capacity project not programmed
8.48 Clark DESERT INN RD @ JONES BLVD Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not Programmed yet.  4+ Ped/bike crashes.
8.39 Clark S DECATUR BLVD @ SAHARA AVE Install exclusive right turn in the westbound dir $225,000.00 Project not Programmed yet
8.32 Clark N LAMB BLVD @ LAKE MEAD BLVD Install protected left turn phase on Lake Mead $100,000.00 Project not Programmed yet
8.14 Clark FLAMINGO RD @ MARYLAND PKWY Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not programmed yet
7.91 Clark TROPICANA AVE @ JONES BLVD Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not Programmed yet.  4+ Ped/bike crashes.
7.73 Clark FLAMINGO RD @ KOVAL LN Red light cameras $80,000.00 Current law restricts use of Red light cameras
7.71 Clark W CHARLESTON BLVD @ MAIN ST Install new striping  on Charleston $475,000.00 Project not Programmed yet
7.37 Clark E CHARLESTON BLVD @ NELLIS Construct left turn on the southbound and the eastbound legs $150,000.00 Partial work constructed by others. Project not programmed yet.
6.66 Clark TROPICANA AVE @ PECOS RD      
6.53 Clark W SAHARA AV @ LAS VEGAS BLVD Construct median islands and install cat tracks for left turn movements $180,000.00 (2003 meeting) Project not programmed yet
6.52 Clark FLAMINGO RD @ EASTERN AVE      
6.40 Clark LAS VEGAS BLVD @ TROPICANA AVE     Safety project changed out signal pole and added heads for the WB to SB left turn lanes.
6.36 Clark RAINBOW BLVD @ DESERT INN RD Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not Programmed yet.
5.84 Clark FLAMINGO RD @ DECATUR BLVD Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not programmed yet. 4+ Ped/Bike crashes.
5.51 Clark TROPICANA AVE @ DECATUR BLVD Adjust left turn permissive phasing for Time Of Day $20,000.00 Project not programmed yet.
5.50 Clark N MARTIN L KING BLVD @ BONANZA RD Install protected left turn phase $100,000.00 Project not programmed yet.
4.98 Clark TROPICANA AVE @ SWENSON ST      

 

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