SEAHC Demonstration Projects

Close-up of High Friction Surface with Calcined Bauxite Aggregate

Under the FHWA Surface Enhancements At Horizontal Curves (SEAHC) effort, demonstration projects have been installed in eight states to date to determine the effect of HFS on reducing crash rates on horizontal curves. The states participating in this effort identified specific horizontal curves with high crash rates that could benefit from the installation of HFS, and installations have been completed in Summer 2009 through Summer 2011.

Completed SEAHC Demonstrations

Projects shown in the map include all projects tested under the SEAHC Program. Projects which were both installed and tested under the SEAHC Program are described in more detail below.

Map of projects tested under the SEAHC Program

Colorado SEAHC Demonstration Projects

Due to deterioration of the underlying pavement, this HFS installation was removed during the milling and repaving of the underlying asphalt pavement.


Site Information

Site Location: Interstate 25, Pueblo, CO (milepost 97.75-97.9)

Highway Description: Four-lane median-divided Interstate highway

Pavement Type:  Hot-mix asphalt

Approximate AADT:  52,600

I-25 Northbound Site Location

I-25 Northbound Site Location

Installation Details

Installation Date(s):  September 14 (inside lane) and 15 (outside lane), 2009

Installation Timeframe: 8 am – 5 pm

Length of Installation:  625 ft (2 lanes)

Total Area:  1,667 SY

Installation Images

HFS installation on I-25 in Colorado

Before and After Images

Before and after HFS installation on I-25 in Colorado

Due to deterioration of the underlying pavement, this HFS installation was removed during the milling and repaving of the underlying asphalt pavement.


Site Information

Site Location: Interstate 25, Pueblo, CO (milepost 97.75-97.9)

Highway Description: Four-lane median-divided Interstate highway

Pavement Type:  Hot-mix asphalt

Approximate AADT:  52,600

I-25 Southbound Site Location

I-25 Southbound Site Location

Installation Details

Installation Date(s):  September 14 (inside lane) and 15 (outside lane), 2009

Installation Timeframe: 8 am – 5 pm

Length of Installation:  550 ft (2 lanes)

Total Area:  1,467 SY

Installation Images

HFS installation on I-25 Southbound in Colorado

Before and After Images

Before and after HFS installation on I-25 Southbound in Colorado

Site Information

Site Location: Colorado State Route 119, ~11.5 miles south of Boulder, CO (milepost 30.4)

Highway Description: Two-lane rural highway

Pavement Type:  Hot-mix asphalt

Approximate AADT:  3,600

SR 119 Site Location

SR 119 Site Location

Installation Details

Installation Date(s):  September 19-20, 2009

Installation Timeframe: 8 am – 5 pm

Length of Installation:  600 ft (2 lanes)

Total Area:  1,600 SY

Installation Images

HFS installation on SR 119 in Colorado

Before and After Images

Before and after HFS installation on SR 119 in Colorado

Site Information

Site Location: US Highway 36, Larimer County, CO (milepost 11)

Highway Description: Two-lane rural highway

Pavement Type:  Hot-mix asphalt

Approximate AADT:  5,700

US 36 Site Location

US 36 Site Location

Installation Details

Installation Date(s):  September 17-18, 2009

Installation Timeframe: 8 am – 5 pm

Length of Installation:  924 ft (2 lanes)

Total Area:  2,464 SY

Installation Images

HFS installation on US 36 in Colorado

Before and After Images

Before and after HFS installation on US 36 in Colorado

HFS Product Information

The SEAHC HFS demonstrations in Colorado were completed by Crafco, Inc. using the HFS product listed below:

  • Product Name: Crafco HFS system
  • Epoxy Type: Epoxy resin
  • Aggregate Type: Crushed flint

Kansas SEAHC Demonstration Projects

Site Information

Site Location: Northbound I-35 to Northbound I-635 Pamp, Kansas City, KS

Highway Description: Single-lane ramp

Pavement Type:  Jointed concrete pavement

Approximate AADT:  26,165

Northbound I-35/Northbound I-635 Ramp Site Location (Kansas City)

Northbound I-35/Northbound I-635 Ramp Site Location (Kansas City)

Installation Details

Installation Date(s):  August 20, 2009

Installation Timeframe: 9 am – 5 pm

Length of Installation:  770 ft (1 lane)

Total Area:  1,240 SY

Installation Images

Northbound I-35, I-635 HFS installation

Before and After Images

Before and after HFS installation on I-35 and I-635 in Kansas City

Site Information

Site Location: K5 (Wolcott Rd.), Leavenworth, KS

Highway Description: Two-lane rural highway

Pavement Type:  Hot-mix asphalt

Approximate AADT:  1,717

K5 Site Location (Leavenworth)

K5 Site Location (Leavenworth)

Installation Details

Installation Date(s):  August 18, 2009

Installation Timeframe: 7 am – 5 pm

Length of Installation:  250 ft (2 lanes)

Total Area:  667 SY

Installation Images

HFS installation on K5 in Kansas

Before and After Images

Before and after HFS installation on K5 in Kansas

Site Information

Site Location: Eastbound K96 to Eastbound US 54 Ramp, Wichita, KS

Highway Description: Single-lane ramp

Pavement Type:  Jointed concrete pavement

Approximate AADT:  6,350

Eastbound K96 to Eastbound US 54 Ramp Site Location (Wichita)

Eastbound K96 to Eastbound US 54 Ramp Site Location (Wichita)

Installation Details

Installation Date(s):  August 23, 2009

Installation Timeframe: 8 pm – 5:30 am

Length of Installation:  820 ft (1 lane)

Total Area:  1,321 SY

Installation Images

HFS installational on K96 and US 54 in Kansas

Before and After Images

Before and after HFS installation on K96 and US 54 in Kansas

Site Information 

Site Location: K99, south of Wamego, KS

Highway Description: Two-lane rural highway

Pavement Type: Hot-mix asphalt

Approximate AADT:  2,780

K99 Site Location (Wabaunsee County)

K99 Site Location (Wabaunsee County)

Installation Details 

Installation Date(s):  August 25, 2009

Installation Timeframe: 7 am – 7 pm

Length of Installation:  450 ft (2 lanes)

Total Area:  1,200 SY

Installation Images

HFS installation on K99 in Kansas

Before and After Images

Before and after HFS installation on K99 in Kansas

HFS Product Information

The SEAHC HFS demonstrations in Kansas were completed by POLY-CARB, Inc. using the HFS product listed below:

  • Product Name: POLY-CARB FLEXOGRID
  • Epoxy Type: Epoxy resin/polyamine solution (MARK-177)
  • Aggregate Type: Crushed flint

Montana SEAHC Demonstration Projects

Site Information

Site Location: Northbound I-15 to Westbound I-90 Ramp, Butte, MT

Highway Description: Single-lane ramp

Pavement Type:  Chip seal over hot-mix asphalt

Approximate AADT:  12,309

Northbound I-15 to Westbound I-90 Ramp (Butte)

Northbound I-15 to Westbound I-90 Ramp (Butte)

Installation Details

Installation Date(s):  September 1, 2009

Installation Timeframe: 8:30 am – 5 pm

Length of Installation:  1,600 ft (1 lane)

Total Area:  2,489 SY 

Installation Images

HFS installation on I-15 and I-90 in Montana

Before and After Images

Before and after HFS installation on I-15 and I-90 in Montana

Site Information

Site Location: Southbound US 93, Missoula, MT

Highway Description: Four-lane divided highway (RP 85.8 to 86.2)

Pavement Type:  Chip seal over hot-mix asphalt

Approximate AADT:  23,820

US 93 Ramp (Missoula)

US 93 Ramp (Missoula)

Installation Details

Installation Date(s):  September 2-3, 2009

Installation Timeframe: 7 am – 4 pm

Length of Installation:  1,375 ft (2 lanes)

Total Area:  3,963 SY

Installation Images

HFS installation on US 93 in Montana

Before and After Images

Before and after HFS installation on US 93 in Montana

HFS Product Information

The SEAHC HFS demonstrations in Montana were completed by POLY-CARB, Inc. using the HFS product listed below:

  • Product Name: POLY-CARB FLEXOGRID
  • Epoxy Type: Epoxy resin/polyamine solution (MARK-177)
  • Aggregate Type: Crushed flint

North Carolina SEAHC Demonstration Projects

Due to deterioration of the underlying pavement, this HFS installation was removed during the milling and repaving of the underlying asphalt pavement.


Site Information

Site Location: Northbound US 311 to Westbound I-40 Ramp, Winston-Salem, NC

Highway Description: Two-lane ramp

Pavement Type:  Hot-mix asphalt

Approximate AADT:  9,500

Northbound US 311 to Westbound I-40 Ramp

Northbound US 311 to Westbound I-40 Ramp

Installation Details

Installation Date(s):  August 6, 2009

Installation Timeframe: 9 pm – 6 am

Length of Installation:  1,000 ft (2 lanes)

Total Area:  2,667 SY

Installation Images

HFS installation at US 311 and I-40 in North Carolina

Before and After Images

Before and after HFS installation on US 311 and I-40 in North Carolina

HFS Product Information

The SEAHC HFS demonstration in North Carolina was completed by Total Maintenance, LLC and Ennis Paint, Inc. using the HFS product listed below:

  • Product Name: Tyregrip
  • Epoxy Type: Highly Modified Epoxy Resin
  • Aggregate Type: Calcined Bauxite

Testing of SEAHC Demonstrations

For each SEAHC HFS installation, friction and texture testing were conducted on the existing pavement surface just before application of the HFS material, and on the finished surface immediately following HFS application.

The following tests were conducted at each site:

  • Dynamic Friction Tester (ASTM E 1911)
  • Circular Track Meter (ASTM E 2157)
  • GripTester (ASTM E 1844 / BS7941)
  • Volumetric Macrotexture Depth (“Sand Patch” – ASTM E 965)
  • RoboTex Texture Measurement (ISO 13473)

Tests were conducted in the right wheelpath and center of the lane at 2-4 locations per site, depending on the section length.  The same tests will be conducted again at each site approximately one year after the HFS was installed.

FAQ for FHWA SEAHC Demo Projects

The purpose of the field trials under the SEAHC effort is to determine the effect of high friction surfacing on reducing accident rates on horizontal curves.  As such, accident data for the three years prior to and three years following the HFS installations will be collected.  Additionally, skid resistance, texture depth, and tire-pavement noise (if appropriate) data will also be collected at each demonstration site.

This website will be kept up-to-date with the latest information on the SEAHC HFS demonstrations.  If you can’t find the information you are looking for, please contact The Transtec Group, or you can contact Mr. Mike Moravec with FHWA’s Office of Pavement Technology at (202) 366-3982 or mike.moravec@dot.gov.

If your state is interested, please contact Mr. Mike Moravec with FHWA’s Office of Pavement Technology at (202) 366-3982 or mike.moravec@dot.gov.

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