[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-295959-105":59,"doc-detail-295959-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","high-friction-surface-treatments-frequently-asked-questions","High Friction Surface Treatments - Frequently Asked Questions","","High Friction Surface Treatments (HFST) answers explain what HFST is, how it works, and why it improves roadway friction performance. The FAQ describes the thin polymer-resin binder with durable high-friction aggregate topping, skid resistance benefits, and how friction can be restored where wear and polishing reduce aggregate performance. It also covers when HFST is likely beneficial, typical installation limits, and safety-related crash modification factors, including reported before/after crash reductions and ongoing pooled-fund evaluations.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/high-friction-surface-treatments-frequently-asked-questions/295959/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/high-friction-surface-treatments-frequently-asked-questions/295959.png","ImageObject",300,407,{"name":92,"@type":93},"Guten tag","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-19","2026-09-18",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",12,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What is a High Friction Surface Treatment (HFST)?","Question",{"text":113,"@type":114},"HFST places a thin layer of specially engineered, durable, high-friction aggregates over a thermosetting polymer resin binder, creating a rough, hard surface. It restores friction where traffic has worn down existing pavement aggregates and can help address certain geometry-related issues.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"What is the purpose of HFST?",{"text":118,"@type":114},"HFST enhances pavement friction for vehicles during critical braking or cornering maneuvers. Maintaining adequate friction is emphasized as critical for safe driving, especially where standard pavements become prematurely polished in sharp curves.",{"name":120,"@type":111,"acceptedAnswer":121},"Are there Crash Modification Factors (CMF) available for HFST?",{"text":122,"@type":114},"Few CMFs are available at this time. TFHRC plans to convert pooled-fund state project results into crash modification factors, with a report expected in spring 2014, and some states report substantial before/after crash reductions.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},295959,1789726305,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":105,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":130,"read_time":41,"preview_page_count":4},687212321768,"https://ap-avatar.wpscdn.com/avatar/a0010bdbe886d2fe77?x-image-process=image/resize,m_fixed,w_180,h_180&k=1789897067658708522","High Friction Surface Treatments  \nFrequently Asked Questions  \nFrequently Asked Questions about High Friction Surface Treatments (HFST)  \n• SAFETY  \n• MAINTENANCE AND OPERATIONS  \n• COST  \n• ENVIRONMENTAL IMPACTS  \n• SITE CONDITIONS  \n• MATERIAL SPECIFICATIONS / DURABILITY  \n• LESSONS LEARNED  \n• INSTALLATION  \n1. What is a High Friction Surface Treatment (HFST)?  \n• High Friction Surface Treatments place a thin layer of specially engineered, durable, high friction aggregates as a topping on a thermosetting polymer resin binder-usually epoxy, modified polyester, or urethane. These aggregate systems have long lasting skid resistance, while also making the overlay much more resistant to wear and polishing. The resin or polymer binder combination locks the aggregate firmly in place, creating an extremely rough, hard, durable surface capable of withstanding everyday roadway demands, such as heavy braking and even snowplowing. HFST restores pavement surface friction characteristics where traffic has worn down existing pavement surface aggregates. HFST can also help compensate for inadequate geometric designs such as sharp curves and/or substandard or variable superelevations.  \n• Aggregates used in an HFST, by definition, have a higher Polished Stone Value (PSV) . This is a laboratory test that measures the friction value after wear from an abrasive wheel. This test is used to predict the friction serviceability after it is exposed to traffic. These values have been correlated with successful HFST performance in field installations. Depending on the version of the PSV test used (ASTM or AASHTO), this value may be different, and so the same version of the test must be used to compare aggregate selections. Although several aggregates have been evaluated, only Calcined Bauxite aggregate has met the threshold for performance necessary to be called an HFST.  \n• An HFST Aggregate Durability Study will be published later this year (2014) in cooperation with FHWA and NCAT.  \n2. What is the purpose of HFST?  \n• HFST can enhance the ability of a road surface to provide pavement friction to vehicles in critical braking or cornering maneuvers. Maintaining the appropriate amount of pavement friction is critical for safe driving. Compared to vehicles driving on a tangent section of road, vehicles traversing horizontal curves require a greater side force friction; and vehicles at intersections require greater longitudinal force friction. In locations such as sharp horizontal curves where vehicles may brake excessively, the road surface of standard pavements may become prematurely polished, thereby reducing the available pavement friction. This friction  \nreduction can contribute to vehicles losing control or skidding when they speed, turn abruptly, or brake excessively. Negotiating a sharper curve demands more friction to keep vehicles on track, and that greater demand causes greater shear forces, thereby leading to even more polishing of the surface aggregate.  \n3. Where are HFSTs likely to be beneficial?  \n• HFST technology is unique in its ability to address site-specific issues. While the largest numbers of problem locations are likely to be on the local and collector systems, there are also high volume intersections, interchange ramps, and selected segments of interstate alignments where these treatments would also be beneficial. This innovation has application to State DOTs, counties, cities, tribes, and federal lands agencies across the country.  \n4. Are there guidelines for the limits on HFST installations?  \n• Typically, HFST should be installed at a point where vehicles start to brake. At horizontal curves, brake lights are a good indication of where treatment should start, as the intention is to slowdown the drivers as they are going into the curve. Most states will end their treatment at the Point of Tangent (PT) .  \n• The Texas Transportation Institute published a paper titled,“Using High Friction Surface Treatments to Improve Safet","cbCaivuIHdF70dNf","https://ap.wps.com/l/cbCaivuIHdF70dNf","pdf",637321,"English","# 1. What is a High Friction Surface Treatment (HFST)?\n## Aggregate requirements and durability studies\n# 2. What is the purpose of HFST?\n# 3. Where are HFSTs likely to be beneficial?\n# 4. Are there guidelines for the limits on HFST installations?\n# SAFETY\n## Crash Modification Factors (CMF) for HFST\n## Advantages compared to traditional horizontal-curve safety treatments","[{\"question\":\"What is a High Friction Surface Treatment (HFST)?\",\"answer\":\"HFST places a thin layer of specially engineered, durable, high-friction aggregates over a thermosetting polymer resin binder, creating a rough, hard surface. It restores friction where traffic has worn down existing pavement aggregates and can help address certain geometry-related issues.\"},{\"question\":\"What is the purpose of HFST?\",\"answer\":\"HFST enhances pavement friction for vehicles during critical braking or cornering maneuvers. Maintaining adequate friction is emphasized as critical for safe driving, especially where standard pavements become prematurely polished in sharp curves.\"},{\"question\":\"Are there Crash Modification Factors (CMF) available for HFST?\",\"answer\":\"Few CMFs are available at this time. TFHRC plans to convert pooled-fund state project results into crash modification factors, with a report expected in spring 2014, and some states report substantial before/after crash reductions.\"}]","High Friction Surface Treatments - Frequently Asked Questions | PDF"]