1.0ITUhttps://www.itu.int/hub/ru/Ralf Vanalsthttps://www.itu.int/hub/ru/author/ralf-vanalstitu-int/rich600338<blockquote class="wp-embedded-content" data-secret="YHqfGMhFmQ"><a href="https://www.itu.int/hub/ru/publication/t-joint-u4ssc-2026-9/">Beijing’s autonomous intelligent signal light, China (People’s 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=YHqfGMhFmQ" width="600" height="338" title="«Beijing’s autonomous intelligent signal light, China (People’s Republic of)» — ITU" data-secret="YHqfGMhFmQ" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !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); //# sourceURL=https://www.itu.int/hub/wp-includes/js/wp-embed.min.js </script> https://www.itu.int/hub/wp-content/uploads/sites/4/2026/08/t-joint-u4ssc-2026-9-img-jpg-m.jpg1024685Beijing'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/