{"id":241318,"date":"2023-09-04T12:31:58","date_gmt":"2023-09-04T10:31:58","guid":{"rendered":"https:\/\/rtrsports.com\/why-do-f1-cars-swerve-and-zig-zag\/"},"modified":"2026-10-06T18:29:55","modified_gmt":"2026-10-06T16:29:55","slug":"why-do-f1-cars-swerve-and-zig-zag","status":"publish","type":"post","link":"https:\/\/rtrsports.com\/en\/blog\/why-do-f1-cars-swerve-and-zig-zag\/","title":{"rendered":"Why do F1 cars swerve back and forth? Tires, brakes and rules"},"content":{"rendered":"<p>The lights are still off, the cars are on the formation lap and the TV director cuts to an aerial shot. Twenty cars swerving from one kerb to the other, one behind the other, like skiers in a slalom. Anyone watching Formula 1 for the first time thinks it is a game, or a problem. It is neither.<\/p>\n<p>F1 cars swerve back and forth mainly to warm up their tires. At low speed tires lose temperature, and a cold tire has little grip. By steering left and right, the driver loads the tires sideways, makes them work and brings them back toward the right temperature. The same move also cleans off dirt picked up on track. Alongside the weaving, drivers accelerate and brake hard to heat the brakes.<\/p>\n<p>What it does not do, despite what you sometimes read, is burn fuel to make the car lighter: that effect is negligible and it is not the point.<\/p>\n<h2>Why do F1 cars swerve and zig zag<\/h2>\n<p>There are three reasons, and they work together.<\/p>\n<ul>\n<li><strong>Tire temperature.<\/strong> A Formula 1 tire only performs at its best within a precise temperature window. Tire blankets heat it in the garage, but as soon as the car goes out and runs slowly, the surface cools. Weaving makes the tire scrub and flex against the tarmac, and the friction puts heat back where it is needed.<\/li>\n<li><strong>Cleaning.<\/strong> Off the racing line the track is covered in worn rubber, dust and small stones. Tires that run over it pick some of it up. Steering decisively helps shed that layer and get back to a clean surface.<\/li>\n<li><strong>Brakes.<\/strong> Carbon brakes only work well when they are hot. That is why, along with the weaving, drivers alternate sharp acceleration and hard braking, sometimes keeping light pressure on the brake while on the throttle.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large\" src=\"https:\/\/rtrsports.com\/wp-content\/uploads\/2023\/09\/carlos-zainz.jpg\" alt=\"Why do F1 cars swerve: a Ferrari on intermediate tires on track, where tire temperature is crucial\" width=\"600\" height=\"338\" \/><\/p>\n<h2>When do drivers swerve<\/h2>\n<p>The best-known moment is the formation lap, the lap before the standing start. It is the last chance to bring tires and brakes up to temperature before the lights go out, when grip under traction and braking into the first corner is needed straight away.<\/p>\n<p>The same happens behind the <a href=\"https:\/\/rtrsports.com\/en\/blog\/f1-safety-cars\/\">safety car<\/a>. The race is neutralized, the cars run much slower than normal and the tires cool lap after lap. Drivers weave so as not to be caught with cold tires at the restart, which is one of the most delicate moments of the race. They also do it, to a lesser extent, under the virtual safety car and on qualifying out-laps.<\/p>\n<p>Weaving matters even more when it is cold or wet: on a wet track the tire struggles to warm up, and a restart on cold tires can cost positions or end in the wall.<\/p>\n<h2>The rules: allowed, with judgment<\/h2>\n<p>Weaving is not banned, but it has to be done safely. The regulations forbid erratic or dangerous driving, and the stewards can penalize anyone who overdoes it or puts the car behind in trouble. On the formation lap, overtaking is not allowed, except to restore the starting order when a car has been delayed.<\/p>\n<p>Behind the safety car the rules are even stricter: each driver must stay within ten car lengths of the car ahead and, once the safety car turns its lights off before pitting, can no longer accelerate or brake erratically, so as not to endanger the restart. Weaving is tolerated as long as it remains a way to keep tires warm, not a trick to make life difficult for others.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large\" src=\"https:\/\/rtrsports.com\/wp-content\/uploads\/2020\/07\/safe-2-1.jpg\" alt=\"F1 cars behind the safety car in Singapore, the moment drivers swerve to keep their tires warm\" width=\"600\" height=\"399\" \/><\/p>\n<h2>Tire blankets are not enough<\/h2>\n<p>You might wonder why all this movement is needed when the tires start out warm. The answer is that blankets heat the tire before the car leaves the garage, but can do nothing during the formation lap or behind the safety car. For a few years Formula 1 considered banning them to cut energy use, but the idea was postponed, and in 2026 they are still allowed, with precise limits: a maximum of 70\u00b0C and two hours of heating for slicks.<\/p>\n<p>The new, narrower and lighter <a href=\"https:\/\/rtrsports.com\/en\/blog\/the-gums-in-formula-1-differences-rules-importance\/\">2026 F1 tires<\/a> have not changed this habit: even with less rubber to heat, tires still cool down at low speed and drivers keep weaving.<\/p>\n<h2>Not just Formula 1<\/h2>\n<p>Weaving is not exclusive to Formula 1. You see it in NASCAR during caution laps, in IndyCar and in endurance racing. The reason is always the same: cold tires mean less grip, and less grip means risk. Only the intensity changes, because every tire has its own temperature window and every car its own way of reaching it.<\/p>\n<p>It is one of those details that say a lot about this sport: even a move that looks like a game is pure preparation. And anyone following Formula 1 closely, perhaps to assess <a href=\"https:\/\/rtrsports.com\/en\/formula-1-sponsorship\/\">Formula 1 sponsorship<\/a>, soon learns that almost nothing on track happens by chance.<\/p>\n    <div itemscope itemtype=\"https:\/\/schema.org\/FAQPage\" class=\"faq-schema-wrapper question-list-wrap\">\r\n\r\n                    <h2><b>Frequently asked questions: why do F1 cars swerve?<\/b><\/h2>\r\n        \r\n        <br \/>\n    <div itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" class=\"faq-item question-list-row\">\r\n\r\n        <h3 class=\"h5\" itemprop=\"name\">\r\n            <b>Why do F1 cars swerve back and forth?<\/b>\r\n        <\/h3>\r\n\r\n        <div itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\r\n            <div itemprop=\"text\" class=\"question-answer\">\r\n                <p>Mainly to warm up the tires, which lose temperature, and therefore grip, at low speed. Weaving also cleans the tires of dirt picked up on track. Combined with bursts of acceleration and hard braking, it also helps heat the brakes.<\/p>\n            <\/div>\r\n        <\/div>\r\n\r\n    <\/div>\r\n    <br \/>\n    <div itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" class=\"faq-item question-list-row\">\r\n\r\n        <h3 class=\"h5\" itemprop=\"name\">\r\n            <b>When do F1 drivers swerve?<\/b>\r\n        <\/h3>\r\n\r\n        <div itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\r\n            <div itemprop=\"text\" class=\"question-answer\">\r\n                <p>On the formation lap before the start, behind the safety car and, to a lesser extent, under the virtual safety car and on qualifying out-laps. In general, whenever they are running slowly and the tires risk cooling down.<\/p>\n            <\/div>\r\n        <\/div>\r\n\r\n    <\/div>\r\n    <br \/>\n    <div itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" class=\"faq-item question-list-row\">\r\n\r\n        <h3 class=\"h5\" itemprop=\"name\">\r\n            <b>Does weaving burn fuel?<\/b>\r\n        <\/h3>\r\n\r\n        <div itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\r\n            <div itemprop=\"text\" class=\"question-answer\">\r\n                <p>No. The effect on fuel consumption is negligible and it is not the purpose. Weaving is about keeping the tires warm and clean.<\/p>\n            <\/div>\r\n        <\/div>\r\n\r\n    <\/div>\r\n    <br \/>\n    <div itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" class=\"faq-item question-list-row\">\r\n\r\n        <h3 class=\"h5\" itemprop=\"name\">\r\n            <b>Is weaving allowed by the rules?<\/b>\r\n        <\/h3>\r\n\r\n        <div itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\r\n            <div itemprop=\"text\" class=\"question-answer\">\r\n                <p>Yes, as long as it is done safely. The stewards can penalize erratic or dangerous driving, and behind the safety car drivers must still stay within ten car lengths of the car ahead without creating risky situations.<\/p>\n            <\/div>\r\n        <\/div>\r\n\r\n    <\/div>\r\n    <br \/>\n    <div itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" class=\"faq-item question-list-row\">\r\n\r\n        <h3 class=\"h5\" itemprop=\"name\">\r\n            <b>Why do they weave if tire blankets already heat the tires?<\/b>\r\n        <\/h3>\r\n\r\n        <div itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\r\n            <div itemprop=\"text\" class=\"question-answer\">\r\n                <p>Blankets heat the tires in the garage, but during the formation lap or behind the safety car the surface cools down. Weaving recovers that heat before the start or the restart.<\/p>\n            <\/div>\r\n        <\/div>\r\n\r\n    <\/div>\r\n    <br \/>\n    <div itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\" class=\"faq-item question-list-row\">\r\n\r\n        <h3 class=\"h5\" itemprop=\"name\">\r\n            <b>Why do NASCAR drivers swerve too?<\/b>\r\n        <\/h3>\r\n\r\n        <div itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\r\n            <div itemprop=\"text\" class=\"question-answer\">\r\n                <p>For the same reason: during caution laps and before restarts they weave to keep the tires warm and clean. You can see it in IndyCar and endurance racing as well.<\/p>\n            <\/div>\r\n        <\/div>\r\n\r\n    <\/div>\r\n    <br \/>\n\r\n    <\/div>\r\n    \n","protected":false},"excerpt":{"rendered":"<p>The lights are still off, the cars are on the formation lap and the TV director cuts to an aerial shot. Twenty cars swerving from one kerb to the other, one behind the other, like skiers in a slalom. Anyone watching Formula 1 for the first time thinks it is a game, or a problem. [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":159573,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[20123],"tags":[],"class_list":["post-241318","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-formula-1-en"],"acf":[],"contentshake_article_id":"","yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v28.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Why do F1 cars swerve? Tires, brakes and safety car rules<\/title>\n<meta name=\"description\" content=\"Why do F1 cars swerve on the formation lap and behind the safety car? 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