{"version":"1.0","provider_name":"ITU","provider_url":"https:\/\/www.itu.int\/hub\/ru\/","author_name":"Ralf Vanalst","author_url":"https:\/\/www.itu.int\/hub\/ru\/author\/ralf-vanalstitu-int\/","title":"Beijing\u2019s autonomous intelligent signal light, China (People\u2019s Republic of) - ITU","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"fFHAB4BB1I\"><a href=\"https:\/\/www.itu.int\/hub\/ru\/publication\/t-joint-u4ssc-2026-9\/\">Beijing\u2019s autonomous intelligent signal light, China (People\u2019s Republic of)<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.itu.int\/hub\/ru\/publication\/t-joint-u4ssc-2026-9\/embed\/#?secret=fFHAB4BB1I\" width=\"600\" height=\"338\" title=\"\u00abBeijing\u2019s autonomous intelligent signal light, China (People\u2019s Republic of)\u00bb &#8212; ITU\" data-secret=\"fFHAB4BB1I\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/www.itu.int\/hub\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","thumbnail_url":"https:\/\/www.itu.int\/hub\/wp-content\/uploads\/sites\/4\/2026\/08\/t-joint-u4ssc-2026-9-img-jpg-m.jpg","thumbnail_width":1024,"thumbnail_height":685,"description":"Beijing's Tongzhou District demonstrates how AI can turn isolated, fixed-time traffic signals into a coordinated and adaptive control network. This U4SSC case study situates the project within Beijing's 2024 \"AI+ Strategy\" and explains how real-time camera and detector data are used to optimise signal timing across intersections, road corridors and wider areas. The system switches among single-point adaptive control during off-peak periods, segmented \"green-wave\" coordination during transition periods, and regional coordination with peripheral traffic diversion during peak hours, while also applying targeted measures on congestion-prone roads. Post-deployment analysis reported a 15.6 per cent increase in average vehicle speed and a 32.5 per cent reduction in average travel time on major urban roads, alongside fewer conflicts and less congestion. The project is also developing into a broader Tongzhou \"city brain\". Remaining limitations concern the completeness and accuracy of data and the system's response to exceptional conditions. The case offers a practical model of dynamic, network-level traffic management while reinforcing the continuing need for data quality and human oversight. More information available at: https:\/\/u4ssc.itu.int\/"}