High friction surface treatment for high crash locations: site selection process

Omar Smadi
Georges Bou-Saab
Zach Hans

Majority of fatal and major injury (severe) crashes occur on horizontal curves. A new and innovative safety improvement method, high friction surface treatment (HFST) was suggested by the federal highway administration (FHWA) in their extended study to examine the pavement safety performance. The Iowa department of transportation (DOT) initially installed this treatment on four sites as part of their safety improvement project in 2012. However, this was not part of a comprehensive policy to use HFST on problem crash curves. Recently, the Iowa DOT had an initiative to implement the HFST throughout the state as a crash mitigation strategy on state and county horizontal curves as part of their safety plan. Regardless of the limited research pertaining to this subject area and unavailability of any formal standards for HFST application, the findings from previous studies showed positive impact on crash rate and friction levels. The primary objective involved developing site selection criteria and identifying candidate sites. Then these candidate sites were refined in a two-phase process taking into account various factors such as traffic volume, geometric features, crash data and pavement condition. Consequently, the initial list of 6,287 state and county two-lane horizontal curves was reduced to 48 candidate sites. The next steps include prioritizing the final list and selecting at least 20 locations for applying the treatment and performing before and after crash study.

LATEST NEWS


2018-06-13

International Conference on Electric Road Systems starts today

Electric Road Systems (ERS) is a relatively new concept with many initiatives on the way. To learn from each other and stimulate new collaborations the Swedish Research and Innovation Platform for Electric Roads arranged the first international conference...


2018-05-18

Same survey of road users’ attitudes in 50 countries

At the Road Safety on Five Continents Conference, RS5C, one entire session presented a large survey of road users' attitudes in 38 countries. Results show large differences between countries in many areas, both regarding behavior and attitudes. A new survey...


2018-05-17

Good results with alcohol interlock program according to Swedish study

An alcohol interlock program makes it possible for drink driving offenders to continue their everyday lives. In a Swedish study most of the participants were satisfied with the program and experienced improved health. They also reported drinking alcohol more...


2018-05-16

Traffic safety in the spotlight

Today the Conference Road Safety on Five Continents (RS5C) opened in Jeju Island, South Korea. More than 220 participators have come from all over the world to present findings and learn about traffic safety. Dr. Young Tae Kim, Secretary-General of the...


2018-04-17

VTI will develop simulators for ambulance staff

VTI has initiated a pilot study for paramedics with the Centre for Teaching & Research in Disaster Medicine and Traumatology and Linköping University. The aim is to give ambulance staff the opportunity to practice critical medical tasks in a moving vehicle in...


2018-04-12

Unique electrified road opens in Sweden

The world’s first electrified road recharging the batteries of cars and trucks while driving opened in Sweden. The Swedish Minister for Infrastructure, Tomas Eneroth, was at the formal inauguration of the electrified road on April 11, 2018. VTI is one of 22...