{"id":12243,"date":"2026-02-16T09:46:57","date_gmt":"2026-02-16T14:46:57","guid":{"rendered":"https:\/\/www.trafficsafetystore.com\/blog\/?p=12243"},"modified":"2026-02-16T14:17:21","modified_gmt":"2026-02-16T19:17:21","slug":"mash-vs-nchrp-350-explained","status":"publish","type":"post","link":"https:\/\/www.trafficsafetystore.com\/blog\/mash-vs-nchrp-350-explained\/","title":{"rendered":"MASH vs NCHRP 350 explained"},"content":{"rendered":"<!-- SEO Meta Description (add in SEO plugin, not body) -->\r\n\r\n<section style=\"max-width: 920px; margin: 0 auto; padding: 20px 16px;\">\r\n<h1 style=\"margin-bottom: 10px;\">MASH vs NCHRP 350: What\u2019s the Difference for Work Zone Devices?<\/h1>\r\nIf you work in highway construction, traffic control, or public infrastructure, you&#8217;ve likely seen specifications referencing either <strong>NCHRP 350<\/strong> or <strong>MASH<\/strong>. But what do these standards actually mean \u2014 and which one applies today?\r\n\r\nUnderstanding the difference is critical when selecting <a href=\"https:\/\/www.trafficsafetystore.com\/traffic-barricades\">barricades<\/a>,\r\n<a href=\"https:\/\/www.trafficsafetystore.com\/traffic-drums\">traffic drums<\/a>,\r\ntemporary barriers, or TMA accessories.\r\n\r\n<hr style=\"margin: 28px 0;\" \/>\r\n\r\n<h2>What Was NCHRP 350?<\/h2>\r\n<strong>NCHRP Report 350<\/strong>, published in 1993 by the National Cooperative Highway Research Program, established crash-testing standards for roadside safety hardware.\r\n\r\nIt defined how devices such as guardrails, crash cushions, temporary barriers, and work zone devices were tested for vehicle impact performance.\r\n\r\nFor many years, NCHRP 350 compliance was the required benchmark for:\r\n<ul>\r\n \t<li>Temporary traffic barriers<\/li>\r\n \t<li>Impact attenuators<\/li>\r\n \t<li>Truck-mounted attenuators (TMAs)<\/li>\r\n \t<li>Work zone channelizing devices<\/li>\r\n<\/ul>\r\nHowever, vehicle design evolved significantly after the 1990s \u2014 prompting the need for updated testing standards.\r\n\r\n<hr style=\"margin: 28px 0;\" \/>\r\n\r\n<h2>What Is MASH?<\/h2>\r\n<strong>MASH<\/strong> stands for <em>Manual for Assessing Safety Hardware<\/em>.\r\n\r\nPublished by the American Association of State Highway and Transportation Officials (AASHTO), MASH updated crash-testing criteria to reflect modern vehicles \u2014 including heavier pickup trucks and SUVs.\r\n\r\nYou can review the current MASH guidelines through\r\n<a href=\"https:\/\/store.transportation.org\/Item\/PublicationDetail?ID=2066\" target=\"_blank\" rel=\"nofollow noopener\">\r\nAASHTO\u2019s official publication\r\n<\/a>.\r\n<h3>Key Updates in MASH Testing:<\/h3>\r\n<ul>\r\n \t<li>Heavier test vehicles (e.g., 5,000 lb pickup trucks)<\/li>\r\n \t<li>Revised impact angles<\/li>\r\n \t<li>Updated evaluation metrics for occupant risk<\/li>\r\n \t<li>More realistic impact conditions<\/li>\r\n<\/ul>\r\nIn short: MASH reflects how vehicles actually behave on today\u2019s roads.\r\n\r\n<hr style=\"margin: 28px 0;\" \/>\r\n\r\n<h2>MASH vs NCHRP 350: Side-by-Side Comparison<\/h2>\r\n<table style=\"width: 100%; border-collapse: collapse; margin: 16px 0;\">\r\n<thead>\r\n<tr>\r\n<th style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\">Feature<\/th>\r\n<th style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\">NCHRP 350<\/th>\r\n<th style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\">MASH<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Publication Year<\/td>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">1993<\/td>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">2009 (updated since)<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Vehicle Types<\/td>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Older vehicle fleet<\/td>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Modern pickups &amp; SUVs<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Crash Realism<\/td>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Pre-SUV era assumptions<\/td>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Current vehicle weights &amp; geometry<\/td>\r\n<\/tr>\r\n<tr>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Current Federal Adoption<\/td>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Phasing out<\/td>\r\n<td style=\"border: 1px solid #ccc; padding: 10px;\">Required for new installations<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n<hr style=\"margin: 28px 0;\" \/>\r\n\r\n<h2>Is MASH Required Today?<\/h2>\r\nYes \u2014 for most federally funded highway projects.\r\n\r\nThe Federal Highway Administration (FHWA) issued guidance requiring new permanent safety hardware installations to meet MASH criteria. You can review FHWA policy updates directly at:\r\n\r\n<a href=\"https:\/\/www.fhwa.dot.gov\/roadway_dept\/countermeasures\/reduce_crashes\/memo.cfm\" target=\"_blank\" rel=\"nofollow noopener\">\r\nFederal Highway Administration (FHWA) Safety Hardware Memoranda\r\n<\/a>\r\n\r\nHowever, some previously installed NCHRP 350 devices may remain in service if already approved.\r\n\r\n<hr style=\"margin: 28px 0;\" \/>\r\n\r\n<h2>What This Means for Contractors &amp; Work Zones<\/h2>\r\nIf you&#8217;re bidding or supplying equipment for public roadway projects, MASH compliance is increasingly required for:\r\n<ul>\r\n \t<li>Temporary concrete barriers<\/li>\r\n \t<li>Water-filled barriers<\/li>\r\n \t<li>Truck-mounted attenuators (TMAs)<\/li>\r\n \t<li>Impact attenuators<\/li>\r\n<\/ul>\r\nChannelizing devices like <a href=\"https:\/\/www.trafficsafetystore.com\/traffic-drums\">traffic drums<\/a> and\r\n<a href=\"https:\/\/www.trafficsafetystore.com\/traffic-barricades\">Type III barricades<\/a> may not require full crash-testing certification the same way longitudinal barriers do \u2014 but specifications still frequently reference MASH-compliant systems.\r\n\r\nAlways verify project specifications carefully before ordering.\r\n\r\n<hr style=\"margin: 28px 0;\" \/>\r\n\r\n<h2>Common Misconceptions<\/h2>\r\n<h3>\u201cIf it was NCHRP 350 approved, it\u2019s still fine everywhere.\u201d<\/h3>\r\nNot necessarily. Many state DOTs now require MASH compliance for new deployments.\r\n<h3>\u201cMASH is just a minor update.\u201d<\/h3>\r\nIt represents a significant modernization of crash testing assumptions and vehicle behavior.\r\n<h3>\u201cAll traffic control devices are crash tested.\u201d<\/h3>\r\nOnly certain categories (like barriers and attenuators) undergo full impact testing. Cones and standard channelizers typically follow visibility and performance standards instead.\r\n\r\n<hr style=\"margin: 28px 0;\" \/>\r\n\r\n<h2>Bottom Line<\/h2>\r\nNCHRP 350 laid the foundation for modern roadside safety hardware testing.\r\nMASH builds on that foundation \u2014 reflecting today\u2019s vehicles and real-world crash conditions.\r\n\r\nIf you&#8217;re supplying or installing work zone protection on public roads, assume MASH compliance will be required unless project documents state otherwise.\r\n\r\nWhen in doubt, confirm with the project engineer or review the state DOT specifications before deployment.\r\n\r\n<hr style=\"margin: 28px 0;\" \/>\r\n<p style=\"font-size: 14px; color: #666;\"><strong>Note:<\/strong> This article is for informational purposes only. Always consult project specifications and applicable state or federal requirements before selecting safety hardware.<\/p>\r\n\r\n<\/section>","protected":false},"excerpt":{"rendered":"<p>MASH vs NCHRP 350: What\u2019s the Difference for Work Zone Devices? If you work in highway construction, traffic control, or public infrastructure, you&#8217;ve likely seen specifications referencing either NCHRP 350 or MASH. But what do these standards actually mean \u2014 and which one applies today? Understanding the difference is critical when selecting barricades, traffic drums, temporary barriers, or TMA accessories. &hellip; <a href=\"https:\/\/www.trafficsafetystore.com\/blog\/mash-vs-nchrp-350-explained\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;MASH vs NCHRP 350 explained&#8221;<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":12246,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[184,1],"tags":[863,864],"class_list":["post-12243","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-resource-guide","category-uncategorized","tag-mash","tag-nchrp-350"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.6 (Yoast 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