Corridor Study

Workshop Presentation for Canyon County

October 21-22, 2009

Corridor StudyWhy are we here tonight?

To talk with you about U.S. 20/26 west of Interstate 84.

To share what we have learned so far.

To hear about your experiences on U.S. 20/26, to help identify its future.

Corridor StudyWhat is a corridor plan?

A mid-range (10-year) plan. Analysis of future travel demand and performance

in the corridor. Evaluation of problems and needs. Identification of corridor improvement priorities.

Our objective is to continue to provide a roadway that is both efficient and safe.

Corridor Study

ITD’s Primary Objectives

Maintain a functional highway - high speed (above 45 mph) links from point to point in Idaho.

Improve safety - identify conflict points or add features that will improve safety and functionality.

Corridor StudyHighway Transportation InvestmentsThe draft 2010-2013 Statewide Transportation

Improvement Program (STIP) does not include any projects for this section of U.S. 20/26.

A STIP is usually a five-year document. This year it is only a four year document because:State funding ($250.4 million) may change after the

Governor’s Transportation Task Force delivers its report in December, 2010.

Federal funding ($302.6 million) from the Highway Trust Fund may change upon reauthorization. The current authorization expired on September 30 and has been extended by continuing resolution. The Trust Fund has been in deficit the last two years ($8 billion each year).

Corridor StudyFunding Challenge:

Idaho’s state and local transportation agencies need an additional $240 million each year to meet increasing transportation needs. ITD has prioritized its existing funds as follows: Operations – Snow plowing, pothole patching,

etc.Preservation – Pavement overlaysRestoration – Rebuilding of the road from the

baseExpansion – Creation of new roads or widening

of current roads (GARVEE)

Corridor Study

What We Know

Corridor StudyTravel Shed Population Growth

Cald-well ZIP

83607

Notus ZIP

83656

Parma ZIP

83660

- 5,000

10,000 15,000 20,000 25,000 30,000 35,000 40,000

20002010

2020

200020102020

Corridor StudyTravel Shed Population (Source: Idaho

Economics, 2008)

Zip Code Areas

2000 actual

2010 estimated

2020 estimated

Rates of Change

Caldwell 83607 16,397 23,847 30,768 +4.4%

Notus 83656 332 469 615 +4.3%

Parma 83660 5,282 6,445 8,448 +3.0%

Corridor US 20/26 Total 22,011 30,761 39,831 +4.0%

Canyon County Total 133,106 192,687 243,802 +4.2%

Corridor Study1994 – 2008 Average Annual Daily

Traffic(Source: Idaho Transportation Department)

Road Section1994 actual

1998 actual

2003 actual

2008 actual

10-Year Rates of Change

State Line to Apple Valley Rd 5,400 4,300 4,200 3,700 -8.5%

Apple Valley Rd to Anderson Corner Rd 5,400 3,300 3,300 3,300 0.0%

Junction US 95 to Notus West City Limit 3,000 4,000 4,000 4,600 +2.0%

City of Notus 3,600 4,000 4,000 4,700 +2.0%

Notus East City Limit to Farmway Rd 3,600 4,400 4,400 6,000 +3.5%

Farmway Rd to Interstate 84 5,000 6,200 6,500 7,400 +2.0%

Corridor StudyLevel of Service (LOS) standard for Rural Highways is “C” or better.LOS can be measured by hourly two-way vehicular traffic and by

annual average daily traffic volumes.

Corridor Study

Jct.

95 to

Not

us

City o

f Not

us

Not

us to

Far

mway

Farm

way

to I-

840

3,000

6,000

9,000

Traffic Growth from Junction 95 to Interstate 84

199820082020 estimated

Source: ITD

Up to 7,200 AADT = LOS B

Up to 12,700 AADT = LOS C

Up to 17,300 AADT = LOS D

Up to 23,500 AADT = LOS E

Source: Florida Department of Transportation

Uninterrupted Flow Highways in Cities of less than 5,000 population

Corridor StudyACCESSNationwide Studies indicate . . .Well managed arterials have 40% - 50% fewer

crashes.An increase of 10–20 access points per mile on major

arterials increases the crash rate by 30%.The 14.060 miles of US 20/26 average 12.3 access

points per mile. State Line to Anderson Corner averages 17.1 access points per mile. Junction 95 to Notus West City Limit averages 7.8 access points per

mile. City of Notus averages 45.3 access points per mile. Notus East City Limit to Farmway Road averages 10.4 access points

per mile. Farmway Road to Interstate 84 averages 14.5 access points per mile.

Corridor StudyHow do access and accidents relate?

Location Miles % Miles Access Points

Access Points

per mile

Accidents 2004 - 2008

Accidents per mile

2004 - 2008

% Access Point

Related Accidents

State Line to Anderson Corner

1.578 11.2 % 27 17.1 14 8.9 35.7 %

Junction 95 to Notus West City Limit

6.116

43.5 %

48 7.8 26 4.3 26.9 %

City of Notus 0.773 5.5 % 35 45.3 11 14.2 72.7 %

Notus East City Limit to Farmway Road

4.419 26.6 % 46 10.4 65 14.7 41.5 %

Farmway Road to Interstate 84

1.174 9.8 % 17 14.5 40 34.1 67.5 %

Corridor StudyAccident ClustersFarmway Road – 10 crashes in the last five

years with an additional 5 crashes nearby.Conway Road – 4 crashes in the last five

years (all eastbound rear-end collisions).

Corridor StudySafety EvaluationSegment Accident Rate Base Rate

(state average)

Evaluation

State Line to Anderson Corner

1.39 1.09 Above base rate

Junction 95 to Notus

0.51 1.14 Below base rate

City of Notus 1.65 1.34 Above base rate

Notus East City Limit to Farmway

1.34 1.34 At base rate

Farmway Road to Interstate 84

2.53 1.16 Above base rate

Source: ITD Office of Highway Safety – 2004 to 2008

Corridor StudySpeed Concerns

Speed studies show we drive an average of 10% over the posted limits

Corridor StudyTransportation Concerns from Scoping

Sessions Access Management Turn lanes at Farmway Road and gravel pit

locations Deceleration lanes Improve shoulder widths east of Farmway Road Vehicle storage at railroad crossings Line of Sight for some locations Drainage

Corridor StudyWhat’s Next?Based on your feedback . . .

Narrow the list of needed improvementsBring policy and physical improvements to

local stakeholder’s Task Force for plan reviewTake recommended plan elements to:

Local planning and zoning commissions Local government (County, City, Highway District) Idaho Transportation Board (ITD)

Corridor StudyStay Involved:For information, visit itd.idaho.gov, go

to Projects, Southwest Idaho, US 20/26 Corridor Study, I-84 to State Line.

Questions, comments or suggestions: comments@itd.idaho.gov

For more information, call ITD Office of Communications at 334-8005.

Corridor StudyThank you for attending!

ITD appreciates your comments and will consider them when drafting the corridor study plan.Please take time to examine the exhibits and

discuss your concerns with us and . . .Take the time to mark up the maps of the US

20/26 corridor study area