{"id":17284,"date":"2026-09-05T18:16:11","date_gmt":"2026-09-05T16:16:11","guid":{"rendered":"https:\/\/www.car-shooters.com\/en\/2026\/09\/05\/act-why-a-self-driving-car-needs-two-of-everything\/"},"modified":"2026-09-05T18:16:11","modified_gmt":"2026-09-05T16:16:11","slug":"act-why-a-self-driving-car-needs-two-of-everything","status":"publish","type":"post","link":"https:\/\/www.car-shooters.com\/en\/2026\/09\/05\/act-why-a-self-driving-car-needs-two-of-everything\/","title":{"rendered":"Act: Why a Self-Driving Car Needs Two of Everything"},"content":{"rendered":"<p>We have already explained <a href=\"https:\/\/www.car-shooters.com\/en\/2026\/09\/05\/think-inside-the-brain-of-a-self-driving-car\/\" target=\"_blank\"><strong>how a self-driving car thinks<\/strong><\/a> &mdash; turning a sensed model of the world into a planned course of action. A plan, though, is not yet a movement: something has to turn &#8220;brake now&#8221; into an actual, physical deceleration of the car, reliably, every single time. This final stage of the <strong>sense, think, act<\/strong> pipeline looks, on paper, like the easiest of the three &mdash; cars have had electronic throttles and electric power steering for decades &mdash; but it hides the one requirement that makes Level 4 fundamentally different from everything that came before it: there is no longer a human being to catch a failure.<\/p>\n<p>&nbsp;<\/p>\n<h2>From mechanical link to electronic command<\/h2>\n<p>We&#8217;ve already covered <a href=\"https:\/\/www.car-shooters.com\/en\/2026\/08\/05\/power-steering-from-hydraulic-to-electric-how-the-effort-at-the-wheel-changes\/\" target=\"_blank\">how power steering evolved from hydraulic assistance to a fully electric system<\/a>, and that shift is exactly what makes automated actuation possible at all: once steering, braking and acceleration are commanded electronically rather than through a direct mechanical or hydraulic link to the driver&#8217;s inputs, a computer can issue the same commands a human foot or hands would, with no physical modification to the car&#8217;s basic architecture. This family of systems is broadly called <strong>drive-by-wire<\/strong>, and it is the actuation layer that &#8220;think&#8221; outputs actually reach.<\/p>\n<p>&nbsp;<\/p>\n<h2>Fail-safe is not good enough anymore<\/h2>\n<p>In a Level 2 car, if a steering or braking actuator glitches, the system can simply hand control back to the driver, or bring the car to a gentle stop with the driver&#8217;s hands already on the wheel &mdash; that&#8217;s a <strong>fail-safe<\/strong> design: when something breaks, defer to the human. A Level 4 car, by definition, may have no attentive human available at the exact moment something breaks. That single fact forces a completely different engineering standard, called <strong>fail-operational<\/strong>: the car has to keep behaving safely, on its own, for long enough to reach a stop, using degraded but still-functioning hardware, not a human backup. In practice, that means duplicating almost everything that could take the car down if it failed alone: two independent power supplies so one electrical fault doesn&#8217;t blind every actuator at once, redundant steering and braking actuation paths, and redundant compute and communication buses running the control software itself, so a single failed component degrades the car&#8217;s capability rather than removing it entirely.<\/p>\n<p>&nbsp;<\/p>\n<h2>The architecture matters as much as the redundancy<\/h2>\n<p>Simply bolting a second component next to the first isn&#8217;t enough if both share a single point of failure somewhere upstream &mdash; a shared power rail, a shared software bug, a shared compromised communication channel. This is why the electronic and software <strong>architecture<\/strong> underneath actuation has become its own research problem, not just a hardware bill of materials: how control functions are partitioned, how safely a system can be updated over its lifetime without introducing new faults, and how resistant the whole chain is to a cyberattack that could otherwise turn redundancy into a single shared weakness.<\/p>\n<p>&nbsp;<\/p>\n<h2>Where the state of the art is heading: EU research on control architecture<\/h2>\n<p>The most complete demonstration to date that perception, decision-making and control need to be engineered as one connected fail-operational system, not three separate problems bolted together, came from <strong><a href=\"https:\/\/cordis.europa.eu\/project\/id\/826653\" target=\"_blank\">NewControl<\/a><\/strong> (2019-2023, &euro;10.91M, coordinated by AVL List in Austria, under the ECSEL Joint Undertaking): it built virtualised platforms covering perception, cognition and control together for highly automated driving, deliberately centred on &#8220;safety by design&#8221; so the whole chain, not just individual components, could be shown to degrade gracefully rather than fail outright. Two further, currently active projects are tackling the architecture question from opposite directions. <strong><a href=\"https:\/\/cordis.europa.eu\/project\/id\/101202007\" target=\"_blank\">EEA4CCAM<\/a><\/strong> (2025-2028, &euro;5.99M, coordinated by Infineon Technologies in Germany, Horizon Europe CCAM Partnership) is developing a <strong>centralised, upgradable in-vehicle electronic control architecture<\/strong>, integrating hardware and software co-design specifically to enable safe, cyber-secure operation and smart data flows across a car&#8217;s control systems. <strong><a href=\"https:\/\/cordis.europa.eu\/project\/id\/101194245\" target=\"_blank\">Shift2SDV<\/a><\/strong> (2025-2028, &euro;19.24M &mdash; one of the largest single projects cited anywhere in this Focus series &mdash; coordinated by Virtual Vehicle Research in Austria, funded through the Chips Joint Undertaking) is building the complementary software layer at industry scale: a common middleware and API framework meant to let the entire European automotive value chain &mdash; carmakers, Tier-1 suppliers and software specialists alike &mdash; develop and update <strong>software-defined vehicle<\/strong> control software as interchangeable modules, rather than each firm maintaining its own closed, monolithic system.<\/p>\n<p>&nbsp;<\/p>\n<h2>Why it matters beyond the spec sheet<\/h2>\n<p>None of the perception or decision-making covered in the earlier parts of this series matters if the last few milliseconds &mdash; command to actuator, actuator to wheel &mdash; can&#8217;t be trusted to work when something has already gone wrong elsewhere in the car. That is precisely why &#8220;act&#8221; is judged by a different standard than the rest of the pipeline: not how well it performs when everything works, but how gracefully it degrades when something doesn&#8217;t, with no one behind the wheel to notice.<\/p>\n<p>&nbsp;<\/p>\n<p><b>Photo:<\/b> <i>&copy; Car-Shooters<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We have already explained how a self-driving car thinks &mdash; turning a sensed model of the world into a planned course of action. A plan, though, is not yet a movement: something has to turn &#8220;brake now&#8221; into an actual, physical deceleration of the car, reliably, every single time. This final stage of the sense, &hellip; <a href=\"https:\/\/www.car-shooters.com\/en\/2026\/09\/05\/act-why-a-self-driving-car-needs-two-of-everything\/\">Continued<\/a><\/p>\n","protected":false},"author":1,"featured_media":15894,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"self driving car actuation redundancy","_yoast_wpseo_metadesc":"Deciding to brake and actually braking are two different problems. The final stage of self-driving turns a computer's decision into steering, braking and acceleration commands - and it has to keep working even when a component fails, with no human to catch the mistake.","footnotes":""},"categories":[285],"tags":[],"class_list":["post-17284","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-focus-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Act: Why a Self-Driving Car Needs Two of Everything | Car - Shooters<\/title>\n<meta name=\"description\" content=\"Deciding to brake and actually braking are two different problems. 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The final stage of self-driving turns a computer&#039;s decision into steering, braking and acceleration commands - and it has to keep working even when a component fails, with no human to catch the mistake.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.car-shooters.com\/en\/2026\/09\/05\/act-why-a-self-driving-car-needs-two-of-everything\/\" \/>\n<meta property=\"og:site_name\" content=\"Car - Shooters\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carshooters\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-05T16:16:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.car-shooters.com\/wp-content\/uploads\/2025\/06\/CAR-SHOOTERS-Tesla-Model-X-Prova-su-Strada-83.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1440\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Edoardo Mascalchi\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Car_Shooters\" \/>\n<meta name=\"twitter:site\" content=\"@Car_Shooters\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Edoardo Mascalchi\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.car-shooters.com\/en\/2026\/09\/05\/act-why-a-self-driving-car-needs-two-of-everything\/\",\"url\":\"https:\/\/www.car-shooters.com\/en\/2026\/09\/05\/act-why-a-self-driving-car-needs-two-of-everything\/\",\"name\":\"Act: Why a Self-Driving Car Needs Two of Everything | Car - Shooters\",\"isPartOf\":{\"@id\":\"https:\/\/www.car-shooters.com\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.car-shooters.com\/en\/2026\/09\/05\/act-why-a-self-driving-car-needs-two-of-everything\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.car-shooters.com\/en\/2026\/09\/05\/act-why-a-self-driving-car-needs-two-of-everything\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.car-shooters.com\/wp-content\/uploads\/2025\/06\/CAR-SHOOTERS-Tesla-Model-X-Prova-su-Strada-83.jpg\",\"datePublished\":\"2026-09-05T16:16:11+00:00\",\"author\":{\"@id\":\"https:\/\/www.car-shooters.com\/en\/#\/schema\/person\/724c222d4f54a294e9a3c9215b18513e\"},\"description\":\"Deciding to brake and actually braking are two different problems. 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