{"id":1005285,"date":"2015-04-09T00:00:07","date_gmt":"2015-04-08T22:00:07","guid":{"rendered":"http:\/\/blog.lufft.com\/?p=5285"},"modified":"2022-07-11T16:43:29","modified_gmt":"2022-07-11T14:43:29","slug":"friction-and-stopping-distances-there-is-a-lot-behind-this-marwis-reading","status":"publish","type":"post","link":"https:\/\/blog.otthydromet.com\/en\/friction-and-stopping-distances-there-is-a-lot-behind-this-marwis-reading\/","title":{"rendered":"Friction &#038; stopping distances: There is a lot behind these MARWIS values"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1005285\" class=\"elementor elementor-1005285 elementor-1005283\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-21edd933 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"21edd933\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3d28d2a2\" data-id=\"3d28d2a2\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-17d9921a elementor-drop-cap-yes elementor-drop-cap-view-default elementor-widget elementor-widget-text-editor\" data-id=\"17d9921a\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;drop_cap&quot;:&quot;yes&quot;}\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tPhysics explained easily: What exactly does the new mobile road sensor MARWIS output \u201cFriction\u201d mean? How does this affect the driving behavior of a vehicle? Here, this will be explained by Karl Schedler.\r\n\r\nOut of the measurement of weather-related parameters on the road or airfield (such as ice percentage, water film height and surface temperature), the <a title=\"MARWIS product offer\" href=\"https:\/\/www.lufft.com\/products\/road-runway-sensors-292\/marwis-umb-mobile-advanced-road-weather-information-sensor-2308\/\" target=\"_blank\" rel=\"noopener\">MARWIS <\/a>calculates which average friction arises.\r\n\r\nThe term friction can be translated into traction or friction coefficient between tire and road surface. The friction coefficient is defined as the ratio between the brake force and the normal force affecting the tire surface area in physical terms (through the weight of the vehicle loading the tire). This definition is equivalent to another definition which may be better applicable in practice: The \u201cfriction\u201d is the ratio of the average braking deceleration (at full braking!) to the acceleration due to gravity (gravitational acceleration measures very roughly 10 m\/s2). The braking deceleration is a negative acceleration (therefore a change of velocity per time unit) and also expressed in \u201cm\/s2\u201d. The relation is a dimensionless number.\r\n\r\nIf you know these connections, the change of the friction value can help to estimate the impact on traffic, because it allows specifying the extension of the stopping distance for a given initial speed. Friction is thus a measure of how slippery the road is.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-812a001 elementor-widget elementor-widget-gallery\" data-id=\"812a001\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;columns&quot;:3,&quot;lazyload&quot;:&quot;yes&quot;,&quot;gallery_layout&quot;:&quot;grid&quot;,&quot;columns_tablet&quot;:2,&quot;columns_mobile&quot;:1,&quot;gap&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:10,&quot;sizes&quot;:[]},&quot;gap_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:10,&quot;sizes&quot;:[]},&quot;gap_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:10,&quot;sizes&quot;:[]},&quot;link_to&quot;:&quot;file&quot;,&quot;aspect_ratio&quot;:&quot;3:2&quot;,&quot;overlay_background&quot;:&quot;yes&quot;,&quot;content_hover_animation&quot;:&quot;fade-in&quot;}\" data-widget_type=\"gallery.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-gallery__container\">\n\t\t\t\t\t\t\t<a class=\"e-gallery-item elementor-gallery-item elementor-animated-content\" href=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2015\/04\/Friction-Wheel.jpg.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"812a001\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTAxMTM1NCwidXJsIjoiaHR0cHM6XC9cL2Jsb2cub3R0aHlkcm9tZXQuY29tXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDE1XC8wNFwvRnJpY3Rpb24tV2hlZWwuanBnLnBuZyIsInNsaWRlc2hvdyI6IjgxMmEwMDEifQ%3D%3D\">\n\t\t\t\t\t<div class=\"e-gallery-image elementor-gallery-item__image\" data-thumbnail=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2015\/04\/Friction-Wheel.jpg-392x360.png\" data-width=\"300\" data-height=\"276\" aria-label=\"\" role=\"img\" ><\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__overlay\"><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t<a class=\"e-gallery-item elementor-gallery-item elementor-animated-content\" href=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2020\/10\/MARWIS_8.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"812a001\" data-elementor-lightbox-title=\"The mobile road weather sensor MARWIS turns vehicles into driving weather stations by detecting several critical road and runway weather parameters.\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6ODk2LCJ1cmwiOiJodHRwczpcL1wvYmxvZy5vdHRoeWRyb21ldC5jb21cL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjBcLzEwXC9NQVJXSVNfOC5wbmciLCJzbGlkZXNob3ciOiI4MTJhMDAxIn0%3D\">\n\t\t\t\t\t<div class=\"e-gallery-image elementor-gallery-item__image\" data-thumbnail=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2020\/10\/MARWIS_8-300x223.png\" data-width=\"300\" data-height=\"223\" aria-label=\"Detailed image MARWIS\" role=\"img\" ><\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__overlay\"><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t<a class=\"e-gallery-item elementor-gallery-item elementor-animated-content\" href=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2015\/04\/MARWIS-App-Friction.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-slideshow=\"812a001\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTAxMTM1NSwidXJsIjoiaHR0cHM6XC9cL2Jsb2cub3R0aHlkcm9tZXQuY29tXC93cC1jb250ZW50XC91cGxvYWRzXC8yMDE1XC8wNFwvTUFSV0lTLUFwcC1GcmljdGlvbi5qcGciLCJzbGlkZXNob3ciOiI4MTJhMDAxIn0%3D\">\n\t\t\t\t\t<div class=\"e-gallery-image elementor-gallery-item__image\" data-thumbnail=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2015\/04\/MARWIS-App-Friction-393x360.jpg\" data-width=\"300\" data-height=\"275\" aria-label=\"\" role=\"img\" ><\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__overlay\"><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ae88b89 elementor-widget elementor-widget-text-editor\" data-id=\"ae88b89\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tFigures based on experience showed, that an average road surface, which has been exposed to the traffic for a longer time, has a friction value of at least 0.82 in dry conditions. In wet weather the value can be reduced down to 0.55. A snow-packed road can have values between 0.5 and 0.2. Black ice values between 0.3 and 0.1 can occur, according to the type of black ice.\r\n\r\nA friction reduction from 0.8 to 0.4 or from 0.6 to 0.3 means a doubling of the braking distance. From 0.8 to 0.2 a four time longer braking distance must be reckoned.\r\n\r\nThe winter services should try to avoid weather-related friction values dropping below 0.6 \u2013 if possible.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ec5dd44 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"ec5dd44\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6a192a8 elementor-widget elementor-widget-text-editor\" data-id=\"6a192a8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tDo you want to learn more about the mobile road weather sensor Lufft MARWIS? Check out our landing page. Do you have further questions on the sensor or are you interested in getting a demo product? Just ask our team, which is happy to help you.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-fe550f6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"fe550f6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-a2a6884\" data-id=\"a2a6884\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-eb16a15 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"eb16a15\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/lufft-marwis.de\/en\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">All About the MARWIS<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-642cfc1\" data-id=\"642cfc1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f1da8f5 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"f1da8f5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/blog.otthydromet.com\/en\/contact\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Talk to Our Experts<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Physics explained easily: What exactly does the new mobile road sensor MARWIS output \u201cFriction\u201d mean? How does this affect the driving behavior of a vehicle? Here, this will be explained by Karl Schedler. Out of the measurement of weather-related parameters on the road or airfield (such as ice percentage, water film height and surface temperature), [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":1005303,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[100,99,1004673],"class_list":["post-1005285","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteorology","tag-marwis-en","tag-road-weather","tag-safety"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Friction &amp; stopping distances: There is a lot behind these MARWIS values - OTT Blog<\/title>\n<meta name=\"description\" content=\"The mobile road weather sensor MARWIS monitors the weather and the road surface condition to calculate the average friction value.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.otthydromet.com\/en\/friction-and-stopping-distances-there-is-a-lot-behind-this-marwis-reading\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Friction &amp; stopping distances: There is a lot behind these MARWIS values - OTT Blog\" \/>\n<meta property=\"og:description\" content=\"The mobile road weather sensor MARWIS monitors the weather and the road surface condition to calculate the average friction value.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.otthydromet.com\/en\/friction-and-stopping-distances-there-is-a-lot-behind-this-marwis-reading\/\" \/>\n<meta property=\"og:site_name\" content=\"OTT Blog\" \/>\n<meta property=\"article:published_time\" content=\"2015-04-08T22:00:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-07-11T14:43:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.otthydromet.com\/wp-content\/uploads\/2015\/04\/Friction_fotolia_Autos-im-Winter_Thaut-Images.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"689\" \/>\n\t<meta property=\"og:image:height\" content=\"341\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"OTT HydroMet Blog Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"OTT HydroMet Blog Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/friction-and-stopping-distances-there-is-a-lot-behind-this-marwis-reading\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.otthydromet.com\/en\/friction-and-stopping-distances-there-is-a-lot-behind-this-marwis-reading\/\"},\"author\":{\"name\":\"OTT HydroMet Blog Team\",\"@id\":\"https:\/\/blog.otthydromet.com\/en\/#\/schema\/person\/af95a261e2bd0d6e87f32548016cbddd\"},\"headline\":\"Friction &#038; 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