{"id":58376,"date":"2026-01-07T14:54:07","date_gmt":"2026-01-07T14:54:07","guid":{"rendered":"https:\/\/testsdmv.com\/study-guides\/illinois\/chapter-12\/"},"modified":"2026-03-19T14:25:05","modified_gmt":"2026-03-19T14:25:05","slug":"chapter-12","status":"publish","type":"page","link":"https:\/\/testsdmv.com\/vi\/study-guides\/illinois\/chapter-12\/","title":{"rendered":"Ch\u01b0\u01a1ng 12: K\u00e9o r\u01a1-mo\u00f3c"},"content":{"rendered":"\n<div>\n<div>\n<div class=\"dmv-lang-container\">\n    <div class=\"dmv-lang-links\">\n        \n<div role=\"navigation\" aria-label=\"Language Switcher\" class=\"wpml-ls-statics-shortcode_actions wpml-ls wpml-ls-legacy-list-horizontal\">\n\t<ul><li class=\"wpml-ls-slot-shortcode_actions wpml-ls-item wpml-ls-item-en wpml-ls-first-item wpml-ls-item-legacy-list-horizontal\">\n\t\t\t\t<a href=\"https:\/\/testsdmv.com\/\" hreflang=\"en\" lang=\"en\" class=\"wpml-ls-link\" aria-label=\"Switch to English\" title=\"Switch to English\">\n\t\t\t\t\t<span class=\"wpml-ls-native\">English<\/span><\/a>\n\t\t\t<\/li><li class=\"wpml-ls-slot-shortcode_actions wpml-ls-item wpml-ls-item-es wpml-ls-item-legacy-list-horizontal\">\n\t\t\t\t<a href=\"https:\/\/testsdmv.com\/es\/\" hreflang=\"es\" lang=\"es\" class=\"wpml-ls-link\" aria-label=\"Switch to Espa\u00f1ol\" title=\"Switch to Espa\u00f1ol\">\n\t\t\t\t\t<span class=\"wpml-ls-native\">Espa\u00f1ol<\/span><\/a>\n\t\t\t<\/li><li class=\"wpml-ls-slot-shortcode_actions wpml-ls-item wpml-ls-item-zh-hans wpml-ls-item-legacy-list-horizontal\">\n\t\t\t\t<a href=\"https:\/\/testsdmv.com\/zh-hans\/\" hreflang=\"zh-hans\" lang=\"zh-hans\" class=\"wpml-ls-link\" aria-label=\"Switch to \u7b80\u4f53\u4e2d\u6587\" title=\"Switch to \u7b80\u4f53\u4e2d\u6587\">\n\t\t\t\t\t<span class=\"wpml-ls-native\">\u7b80\u4f53\u4e2d\u6587<\/span><\/a>\n\t\t\t<\/li><li class=\"wpml-ls-slot-shortcode_actions wpml-ls-item wpml-ls-item-ko wpml-ls-last-item wpml-ls-item-legacy-list-horizontal\">\n\t\t\t\t<a href=\"https:\/\/testsdmv.com\/ko\/\" hreflang=\"ko\" lang=\"ko\" class=\"wpml-ls-link\" aria-label=\"Switch to \ud55c\uad6d\uc5b4\" title=\"Switch to \ud55c\uad6d\uc5b4\">\n\t\t\t\t\t<span class=\"wpml-ls-native\">\ud55c\uad6d\uc5b4<\/span><\/a>\n\t\t\t<\/li><\/ul>\n<\/div>\n\n    <\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"gb-element-ccfc5d40\">\n<p class=\"gb-text gb-text-0f6f7956\">H\u00e3y s\u1eed d\u1ee5ng h\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u1ec3 chu\u1ea9n b\u1ecb cho k\u1ef3 thi v\u00e0 tham kh\u1ea3o s\u1ed5 tay ch\u00ednh th\u1ee9c \u0111\u1ec3 bi\u1ebft \u0111\u1ea7y \u0111\u1ee7 th\u00f4ng tin.<\/p>\n<\/div>\n\n\n\n<aside class=\"gb-element-67617362\">\n<div class=\"gb-accordion gb-accordion-025724cd\">\n<div class=\"gb-accordion__item gb-accordion__item-88eef01e gb-accordion__item-open\">\n<div role=\"button\" tabindex=\"0\" class=\"gb-accordion__toggle gb-accordion__toggle-760b9f99 gb-block-is-current\" id=\"gb-accordion-toggle-760b9f99\">\n<span class=\"gb-text\">Trong ch\u01b0\u01a1ng n\u00e0y:<\/span>\n\n\n\n<span class=\"gb-accordion__toggle-icon gb-accordion__toggle-icon-37c071d3\"><span class=\"gb-accordion__toggle-icon-open\"><svg aria-hidden=\"true\" viewBox=\"0 0 256 256\"><rect width=\"256\" height=\"256\" fill=\"none\"><\/rect><polyline points=\"208 96 128 176 48 96\" fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"16\"><\/polyline><\/svg><\/span><span class=\"gb-accordion__toggle-icon-close\"><svg aria-hidden=\"true\" viewBox=\"0 0 256 256\"><rect width=\"256\" height=\"256\" fill=\"none\"><\/rect><polyline points=\"48 160 128 80 208 160\" fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"16\"><\/polyline><\/svg><\/span><\/span>\n<\/div>\n\n\n\n<div class=\"gb-accordion__content\" id=\"gb-accordion-content-67669fb5\">\n<div class=\"gb-element-32d91237\"><nav class=\"chapter-nav-auto\" aria-label=\"Chapter sections\"><ul><li><a href=\"#trailer-equipment-loading\">Thi\u1ebft b\u1ecb v\u00e0 X\u1ebfp h\u00e0ng<\/a><\/li><li><a href=\"#driving-with-trailer\">L\u00e1i xe v\u1edbi R\u01a1-mo\u00f3c<\/a><\/li><li><a href=\"#quick-numbers\">B\u1ea3ng S\u1ed1 li\u1ec7u Nhanh<\/a><\/li><li><a href=\"#points-suspension\">B\u1ea3ng \u0110i\u1ec3m\/\u0110\u00ecnh ch\u1ec9<\/a><\/li><li><a href=\"#updates-today\">B\u1ea3ng C\u1eadp nh\u1eadt (H\u00f4m nay)<\/a><\/li><li><a href=\"#test-yourself\">T\u1ef1 ki\u1ec3m tra<\/a><\/li><\/ul><\/nav>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/aside>\n\n\n\n<div class=\"study-guide-content\">\n<div class=\"gb-element-9f5e0b5d\">\n<p class=\"wp-block-paragraph\">Vi\u1ec7c k\u00e9o r\u01a1-mo\u00f3c m\u1ed9t c\u00e1ch an to\u00e0n \u0111\u00f2i h\u1ecfi m\u1ed9t b\u1ed9 k\u1ef9 n\u0103ng v\u00e0 ki\u1ebfn th\u1ee9c \u0111\u1ed9c \u0111\u00e1o ngo\u00e0i vi\u1ec7c l\u00e1i xe ti\u00eau chu\u1ea9n. Tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 chi\u1ec1u d\u00e0i t\u0103ng th\u00eam c\u1ee7a m\u1ed9t chi\u1ebfc r\u01a1-mo\u00f3c l\u00e0m thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 kh\u1ea3 n\u0103ng x\u1eed l\u00fd, t\u0103ng t\u1ed1c v\u00e0 phanh c\u1ee7a m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n. Hi\u1ec3u r\u00f5 c\u00e1c y\u00eau c\u1ea7u v\u1ec1 thi\u1ebft b\u1ecb c\u1ee5 th\u1ec3, k\u1ef9 thu\u1eadt x\u1ebfp h\u00e0ng \u0111\u00fang c\u00e1ch v\u00e0 c\u00e1c \u0111i\u1ec1u ch\u1ec9nh khi l\u00e1i xe l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 ng\u0103n ng\u1eeba c\u00e1c t\u00ecnh hu\u1ed1ng nguy hi\u1ec3m nh\u01b0 r\u01a1-mo\u00f3c b\u1ecb l\u1eafc l\u01b0 ho\u1eb7c va ch\u1ea1m, v\u00e0 l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng c\u1ee7a vi\u1ec7c tr\u1edf th\u00e0nh m\u1ed9t ng\u01b0\u1eddi l\u00e1i xe c\u00f3 tr\u00e1ch nhi\u1ec7m v\u00e0 an to\u00e0n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"trailer-equipment-loading\">Thi\u1ebft b\u1ecb v\u00e0 X\u1ebfp h\u00e0ng<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc khi k\u00e9o b\u1ea5t k\u1ef3 r\u01a1-mo\u00f3c n\u00e0o, ng\u01b0\u1eddi l\u00e1i xe ph\u1ea3i \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u1ea3 xe k\u00e9o v\u00e0 r\u01a1-mo\u00f3c \u0111\u1ec1u \u0111\u01b0\u1ee3c trang b\u1ecb \u0111\u00fang c\u00e1ch v\u00e0 h\u00e0ng h\u00f3a \u0111\u01b0\u1ee3c x\u1ebfp \u0111\u00fang c\u00e1ch \u0111\u1ec3 duy tr\u00ec s\u1ef1 \u1ed5n \u0111\u1ecbnh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Thi\u1ebft b\u1ecb B\u1eaft bu\u1ed9c<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>M\u00f3c k\u00e9o:<\/strong> M\u00f3c k\u00e9o ph\u1ea3i l\u00e0 lo\u1ea1i bi v\u00e0 \u1ed5 c\u1eafm \u0111\u01b0\u1ee3c g\u1eafn ch\u1eafc ch\u1eafn v\u00e0o xe k\u00e9o. N\u00f3 ph\u1ea3i \u0111\u1ee7 m\u1ea1nh \u0111\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a r\u01a1-mo\u00f3c.<\/li>\n\n\n\n<li><strong>D\u00e2y x\u00edch An to\u00e0n:<\/strong> C\u1ea7n c\u00f3 hai d\u00e2y x\u00edch an to\u00e0n \u0111\u1ec3 n\u1ed1i r\u01a1-mo\u00f3c v\u1edbi xe k\u00e9o. Nh\u1eefng d\u00e2y x\u00edch n\u00e0y ph\u1ea3i \u0111\u1ee7 m\u1ea1nh \u0111\u1ec3 gi\u1eef r\u01a1-mo\u00f3c v\u00e0 ng\u0103n n\u00f3 ho\u00e0n to\u00e0n t\u00e1ch kh\u1ecfi xe k\u00e9o n\u1ebfu m\u00f3c k\u00e9o b\u1ecb h\u1ecfng. C\u00e1c d\u00e2y x\u00edch n\u00ean \u0111\u01b0\u1ee3c b\u1eaft ch\u00e9o d\u01b0\u1edbi l\u01b0\u1ee1i r\u01a1-mo\u00f3c theo h\u00ecnh ch\u1eef &#8220;X&#8221; v\u00e0 c\u00f3 \u0111\u1ee7 \u0111\u1ed9 ch\u00f9ng \u0111\u1ec3 cho ph\u00e9p r\u1ebd, nh\u01b0ng kh\u00f4ng qu\u00e1 nhi\u1ec1u \u0111\u1ec3 ch\u00fang k\u00e9o l\u00ea tr\u00ean m\u1eb7t \u0111\u1ea5t.<\/li>\n\n\n\n<li><strong>\u0110\u00e8n:<\/strong> R\u01a1-mo\u00f3c ph\u1ea3i c\u00f3 m\u1ed9t h\u1ec7 th\u1ed1ng chi\u1ebfu s\u00e1ng ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi xe k\u00e9o. \u0110i\u1ec1u n\u00e0y bao g\u1ed3m \u0111\u00e8n h\u1eadu, \u0111\u00e8n phanh v\u00e0 \u0111\u00e8n xi-nhan ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed3ng b\u1ed9 v\u1edbi \u0111\u00e8n c\u1ee7a xe k\u00e9o.<\/li>\n\n\n\n<li><strong>Phanh R\u01a1-mo\u00f3c:<\/strong> \u1ede Illinois, m\u1ed9t h\u1ec7 th\u1ed1ng phanh ri\u00eang tr\u00ean r\u01a1-mo\u00f3c l\u00e0 b\u1eaft bu\u1ed9c n\u1ebfu t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u00f3 l\u00e0 <strong>3.000 pound<\/strong> (kho\u1ea3ng 1.360 kg) tr\u1edf l\u00ean. Nh\u1eefng phanh n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1eb1ng \u0111i\u1ec7n t\u1eed b\u1edfi m\u1ed9t b\u1ed9 \u0111i\u1ec1u khi\u1ec3n trong cabin c\u1ee7a xe k\u00e9o v\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 d\u1eebng xe an to\u00e0n.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">X\u1ebfp h\u00e0ng \u0110\u00fang c\u00e1ch (Quy t\u1eafc 60\/40)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Y\u1ebfu t\u1ed1 quan tr\u1ecdng nh\u1ea5t trong vi\u1ec7c ng\u0103n ng\u1eeba r\u01a1-mo\u00f3c b\u1ecb l\u1eafc l\u01b0 l\u00e0 ph\u00e2n b\u1ed5 tr\u1ecdng l\u01b0\u1ee3ng \u0111\u00fang c\u00e1ch. M\u1ed9t chi\u1ebfc r\u01a1-mo\u00f3c \u0111\u01b0\u1ee3c x\u1ebfp h\u00e0ng kh\u00f4ng \u0111\u00fang c\u00e1ch s\u1ebd kh\u00f4ng \u1ed5n \u0111\u1ecbnh v\u00e0 c\u1ef1c k\u1ef3 nguy hi\u1ec3m.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Quy t\u1eafc 60\/40:<\/strong> Khi x\u1ebfp h\u00e0ng, h\u00e3y \u0111\u1eb7t kho\u1ea3ng <strong>60%<\/strong> t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng \u1edf n\u1eeda tr\u01b0\u1edbc c\u1ee7a r\u01a1-mo\u00f3c (ph\u00eda tr\u01b0\u1edbc tr\u1ee5c) v\u00e0 <strong>40%<\/strong> \u1edf n\u1eeda sau.<\/li>\n\n\n\n<li><strong>Tr\u1ecdng l\u01b0\u1ee3ng L\u01b0\u1ee1i k\u00e9o:<\/strong> \u00c1p l\u1ef1c h\u01b0\u1edbng xu\u1ed1ng tr\u00ean bi m\u00f3c k\u00e9o, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng l\u01b0\u1ee1i k\u00e9o, n\u00ean n\u1eb1m trong kho\u1ea3ng t\u1eeb 10% \u0111\u1ebfn 15% t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng r\u01a1-mo\u00f3c \u0111\u00e3 t\u1ea3i. Qu\u00e1 \u00edt tr\u1ecdng l\u01b0\u1ee3ng l\u01b0\u1ee1i k\u00e9o s\u1ebd khi\u1ebfn r\u01a1-mo\u00f3c b\u1ecb l\u1eafc l\u01b0, trong khi qu\u00e1 nhi\u1ec1u s\u1ebd l\u00e0m n\u1eb7ng ph\u1ea7n sau c\u1ee7a xe k\u00e9o, n\u00e2ng b\u00e1nh tr\u01b0\u1edbc l\u00ean v\u00e0 l\u00e0m suy gi\u1ea3m kh\u1ea3 n\u0103ng l\u00e1i v\u00e0 phanh.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>M\u1eb9o hay:<\/strong><br>Sau khi x\u1ebfp h\u00e0ng l\u00ean r\u01a1-mo\u00f3c, h\u00e3y ki\u1ec3m tra tr\u1ecdng l\u01b0\u1ee3ng l\u01b0\u1ee1i k\u00e9o b\u1eb1ng c\u00e1ch quan s\u00e1t xe k\u00e9o c\u1ee7a b\u1ea1n. Ph\u1ea7n sau c\u1ee7a xe ch\u1ec9 n\u00ean ch\u00f9ng xu\u1ed1ng m\u1ed9t ch\u00fat. N\u1ebfu c\u1ea3n sau r\u1ea5t th\u1ea5p v\u00e0 \u0111\u00e8n pha chi\u1ebfu l\u00ean, b\u1ea1n c\u00f3 qu\u00e1 nhi\u1ec1u tr\u1ecdng l\u01b0\u1ee3ng l\u01b0\u1ee1i k\u00e9o. N\u1ebfu ph\u1ea7n sau c\u1ee7a xe c\u00f3 v\u1ebb cao h\u01a1n b\u00ecnh th\u01b0\u1eddng, b\u1ea1n c\u00f3 qu\u00e1 \u00edt.<\/p>\n<\/blockquote>\n<\/div>\n\n\n<\/p>\n\n\n\n<div class=\"gb-element-3735b8d6\">\n<div>\n<p class=\"gb-text gb-text-61ea4bd9\">\ud83d\udd12<\/p>\n<\/div>\n\n\n\n<p class=\"gb-text\">\u0110\u00e2y l\u00e0 n\u1ed9i dung Premium. Truy c\u1eadp n\u1ed9i dung b\u1ecb gi\u1edbi h\u1ea1n \u2014 c\u00e1c B\u00e0i thi DMV m\u1edf r\u1ed9ng, H\u01b0\u1edbng d\u1eabn h\u1ecdc t\u1eadp v\u00e0 b\u00e0i thi CDL.<\/p>\n\n\n\n<a class=\"gb-text gb-text-4785f37c\" href=\"https:\/\/testsdmv.com\/vi\/pricing\/\">Truy c\u1eadp G\u00f3i Premium<\/a>\n\n\n\n<p class=\"gb-text gb-text-95adcd10\"><em>\u0110\u00e3 mua? <a href=\"https:\/\/testsdmv.com\/vi\/sign-in\/\">\u0110\u0103ng nh\u1eadp<\/a><\/em><\/p>\n<\/div>\n\n\n<p>\n\n\n\n\n\n\n<div><nav class=\"tdmv-nav-container\" aria-label=\"Page navigation\"><a href=\"https:\/\/testsdmv.com\/vi\/study-guides\/illinois\/chapter-11\/\" class=\"tdmv-nav-btn prev-btn\">< Ch\u01b0\u01a1ng tr\u01b0\u1edbc<\/a><span class=\"empty-nav-placeholder\"><\/span><\/nav>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Vi\u1ec7c k\u00e9o r\u01a1-mo\u00f3c m\u1ed9t c\u00e1ch an to\u00e0n \u0111\u00f2i h\u1ecfi m\u1ed9t b\u1ed9 k\u1ef9 n\u0103ng v\u00e0 ki\u1ebfn th\u1ee9c \u0111\u1ed9c \u0111\u00e1o ngo\u00e0i vi\u1ec7c l\u00e1i xe ti\u00eau chu\u1ea9n. Tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 chi\u1ec1u d\u00e0i t\u0103ng th\u00eam c\u1ee7a m\u1ed9t chi\u1ebfc r\u01a1-mo\u00f3c l\u00e0m thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 kh\u1ea3 n\u0103ng x\u1eed l\u00fd, t\u0103ng t\u1ed1c v\u00e0 phanh c\u1ee7a m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n. Hi\u1ec3u r\u00f5 c\u00e1c &#8230; <a title=\"Ch\u01b0\u01a1ng 12: K\u00e9o r\u01a1-mo\u00f3c\" class=\"read-more\" href=\"https:\/\/testsdmv.com\/vi\/study-guides\/illinois\/chapter-12\/\" aria-label=\"Read more about Ch\u01b0\u01a1ng 12: K\u00e9o r\u01a1-mo\u00f3c\">Read more<\/a><\/p>\n","protected":false},"author":30,"featured_media":34219,"parent":55952,"menu_order":12,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-58376","page","type-page","status-publish","has-post-thumbnail"],"_links":{"self":[{"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/pages\/58376","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/users\/30"}],"replies":[{"embeddable":true,"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/comments?post=58376"}],"version-history":[{"count":0,"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/pages\/58376\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/pages\/55952"}],"wp:attachment":[{"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/media?parent=58376"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}