[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-1-en-105":3,"doc-seo-253637-105":53,"doc-detail-253637-en":126},{"code":4,"msg":5,"data":6},0,"success",[7,14,19,24,29,34,39,44,49],{"id":8,"doc_module":9,"doc_module_name":10,"category_name":11,"show_sort_weight":12,"slug":13},11,1,"Template","Presentations",90,"presentations",{"id":15,"doc_module":9,"doc_module_name":10,"category_name":16,"show_sort_weight":17,"slug":18},12,"Resumes",80,"resumes",{"id":20,"doc_module":9,"doc_module_name":10,"category_name":21,"show_sort_weight":22,"slug":23},14,"Invoices",70,"invoices",{"id":25,"doc_module":9,"doc_module_name":10,"category_name":26,"show_sort_weight":27,"slug":28},15,"Posters",60,"posters",{"id":30,"doc_module":9,"doc_module_name":10,"category_name":31,"show_sort_weight":32,"slug":33},16,"Social Media",50,"social-media",{"id":35,"doc_module":9,"doc_module_name":10,"category_name":36,"show_sort_weight":37,"slug":38},17,"Forms",40,"forms",{"id":40,"doc_module":9,"doc_module_name":10,"category_name":41,"show_sort_weight":42,"slug":43},18,"Letters",30,"letters",{"id":45,"doc_module":9,"doc_module_name":10,"category_name":46,"show_sort_weight":47,"slug":48},21,"Paper Templates",5,"papers-templates",{"id":50,"doc_module":9,"doc_module_name":10,"category_name":51,"show_sort_weight":4,"slug":52},158,"General","general-158",{"code":4,"msg":54,"data":55},"ok",{"site_id":56,"language":57,"slug":58,"title":59,"keywords":60,"description":61,"schema_data":62,"social_meta":119,"head_meta":121,"extra_data":123,"updated_unix":125},105,"en","traffic-data-computation-method-pocket-guide","Traffic Data Computation Method - POCKET GUIDE","","Traffic Data Computation Method Pocket Guide provides a structured reference for calculating key traffic engineering inputs used in transportation planning and roadway design. It covers essential measures such as speed percentiles, AADT and ADT variants, truck and ESAL-related computations, capacity, directional design volumes, intersection and signal parameters, and vehicle-class conversions. The pocket guide also consolidates supporting concepts like free flow, headway, saturation flow, K-factors, occupancy, VMT, and volume-to-capacity relationships, enabling consistent, objective application of FHWA methodology.",{"@graph":63,"@context":118},[64,80,101],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":51,"@type":70,"position":76},"https://docshare.wps.com/template/general/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/traffic-data-computation-method-pocket-guide/253637/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/traffic-data-computation-method-pocket-guide/253637.png","ImageObject",442,249,{"name":88,"@type":89},"Elsa","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-09-20","2026-09-13",true,{"@type":98,"interactionType":99,"userInteractionCount":76},"InteractionCounter",{"@type":100},"ViewAction",{"@type":102,"mainEntity":103},"FAQPage",[104,110,114],{"name":105,"@type":106,"acceptedAnswer":107},"What purpose does the Traffic Data Computation Method Pocket Guide serve?","Question",{"text":108,"@type":109},"It consolidates FHWA traffic computation concepts and measures into a structured reference for calculating common inputs used in traffic analysis and roadway design.","Answer",{"name":111,"@type":106,"acceptedAnswer":112},"Which traffic volume measures are included in the guide?",{"text":113,"@type":109},"The guide includes AADT-related measures (AADT, ADT, MADT) and truck-focused variants such as AADTT, along with directional design-hour volumes and demand-related parameters.",{"name":115,"@type":106,"acceptedAnswer":116},"Does the pocket guide cover both vehicle speed and roadway capacity concepts?",{"text":117,"@type":109},"Yes. It includes topics such as 85th percentile speed, critical speed, headway, free flow, saturation flow/headway, capacity, and volume-to-capacity ratio relationships.","https://schema.org",{"og:url":78,"og:type":120,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":122,"canonical":78},"index,follow",{"doc_id":124,"site_id":56},253637,1789268130,{"code":4,"msg":5,"data":127},{"doc_id":124,"user_id":128,"nickname":88,"user_avatar":129,"doc_module":9,"category_id":50,"category_name":51,"doc_title":59,"doc_description":61,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":76,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":135,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":125,"read_time":140},137455077381,"https://ap-avatar.wpscdn.com/davatar_994ba38a5ba835b3df7d355c54d3ed8d","Publication No. FHWA-PL-18-027  \nAugust 2018  \nTraffic Data  \nComputation Method  \nPOCKET GUIDE  \nNOTICE  \nThis document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document.  \nThe U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names appear in this report only because they are considered essential to the objective of the document.  \nQUALITY ASSURANCE STATEMENT  \nThe Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.  \nTable of Contents  \nTable of Contents .............................................................. i  \nList of Figures .................................................................. iv  \nList of Tables .................................................................... v  \nAbbreviations .................................................................. vii  \nPreface ............................................................................. 1  \n85th Percentile Speed ........................................................4  \nAnnual Average Daily Traffic (AADT) ................................6  \nAnnual Average Daily Truck Traffic (AADTT) ....................8  \nAverage Daily Traffic (ADT) ............................................ 10  \nAxle Correction Factor (ACF) .......................................... 12  \nCapacity .......................................................................... 14  \nChange Rate ................................................................... 16  \nCombination Unit Truck AADT ........................................ 18  \nCritical Speed..................................................................20  \nDesign Hour....................................................................22  \nDesign Vehicles...............................................................24  \nDesign Volume................................................................26  \nDirectional Design-Hour Volume (DDHV) ........................28  \nDirectional Factor ...........................................................30  \nDirectional Flow Rate and Ratio ......................................32  \nEquivalent Single Axle Load (ESAL) ................................34  \nFree Flow ........................................................................36  \nFuture AADT ...................................................................38  \nGross Vehicle Weight (GVW) ..........................................40  \nHeadway .........................................................................42  \nK-Factor ..........................................................................44  \nLane Groups ...................................................................46  \nLoad Spectra ...................................................................48  \nMonth of Year and Day of Week Factors ........................50  \nMonthly Average Daily Traffic (MADT) ............................52  \nNumber of Intersections of Other Type ..........................54  \nNumber of Signalized Intersections ................................56  \nNumber of Stop Sign Intersections .................................58  \nPassenger Car Equivalent (PCE) .....................................60  \nPeak Hour Factor (PHF) ..................................................62  \nPercent Green Time ........................................................64  \nPercent Peak Combination Unit Trucks ...........................66  \nPercent Peak Single Unit Trucks & Buses ..................","cbCaiv3KcIXOEoFL","https://ap.wps.com/l/cbCaiv3KcIXOEoFL","pdf",1202929,116,"English","# Preface\n# 85th Percentile Speed\n# Annual Average Daily Traffic (AADT)\n# Annual Average Daily Truck Traffic (AADTT)\n# Average Daily Traffic (ADT)\n# Axle Correction Factor (ACF)\n# Capacity\n# Change Rate\n# Combination Unit Truck AADT\n# Critical Speed\n# Design Hour\n# Design Vehicles\n# Design Volume\n# Directional Design-Hour Volume (DDHV)\n# Directional Factor\n# Directional Flow Rate and Ratio\n# Equivalent Single Axle Load (ESAL)\n# Free Flow\n# Future AADT\n# Gross Vehicle Weight (GVW)\n# Headway\n# K-Factor\n# Lane Groups\n# Load Spectra\n# Month of Year and Day of Week Factors\n# Monthly Average Daily Traffic (MADT)\n# Number of Intersections of Other Type\n# Number of Signalized Intersections\n# Number of Stop Sign Intersections\n# Passenger Car Equivalent (PCE)\n# Peak Hour Factor (PHF)\n# Percent Green Time\n# Percent Peak Combination Unit Trucks\n# Percent Peak Single Unit Trucks & Buses\n# Roadway Occupancy\n# Saturation Flow\n# Saturation Headway\n# Short Term Count ADT by Vehicle Class to AADT by Vehicle Class Conversion\n# Short Term Count ADT to AADT Conversion\n# Signal Type\n# Single Unit Truck & Bus AADT\n# Time of Day (TOD) Factor\n# Traffic Demand\n# Turning Radius\n# Vehicle Class Factoring\n# Vehicle Density\n# Vehicle Miles Traveled (VMT)\n# Vehicle Speed\n# Volume and Volume-to-Capacity Ratio\n# Index","[{\"question\":\"What purpose does the Traffic Data Computation Method Pocket Guide serve?\",\"answer\":\"It consolidates FHWA traffic computation concepts and measures into a structured reference for calculating common inputs used in traffic analysis and roadway design.\"},{\"question\":\"Which traffic volume measures are included in the guide?\",\"answer\":\"The guide includes AADT-related measures (AADT, ADT, MADT) and truck-focused variants such as AADTT, along with directional design-hour volumes and demand-related parameters.\"},{\"question\":\"Does the pocket guide cover both vehicle speed and roadway capacity concepts?\",\"answer\":\"Yes. It includes topics such as 85th percentile speed, critical speed, headway, free flow, saturation flow/headway, capacity, and volume-to-capacity ratio relationships.\"}]","Traffic Data Computation Method - POCKET GUIDE | PDF",41]