{"id":60891,"date":"2026-01-07T15:38:06","date_gmt":"2026-01-07T15:38:06","guid":{"rendered":"https:\/\/testsdmv.com\/study-guides\/pennsylvania\/chapter-12\/"},"modified":"2026-03-20T13:46:53","modified_gmt":"2026-03-20T13:46:53","slug":"chapter-12","status":"publish","type":"page","link":"https:\/\/testsdmv.com\/vi\/study-guides\/pennsylvania\/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-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><li class=\"wpml-ls-slot-shortcode_actions wpml-ls-item wpml-ls-item-fil-ph wpml-ls-last-item wpml-ls-item-legacy-list-horizontal\">\n\t\t\t\t<a href=\"https:\/\/testsdmv.com\/fil-ph\/\" hreflang=\"fil-ph\" lang=\"fil-ph\" class=\"wpml-ls-link\" aria-label=\"Switch to Tagalog\" title=\"Switch to Tagalog\">\n\t\t\t\t\t<span class=\"wpml-ls-native\">Tagalog<\/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 Ch\u1ea5t h\u00e0ng<\/a><\/li><li><a href=\"#driving-with-trailer\">L\u00e1i xe khi k\u00e9o R\u01a1-mo\u00f3c<\/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-323e0f1e\">\n<p class=\"wp-block-paragraph\">K\u00e9o r\u01a1-mo\u00f3c, d\u00f9 \u0111\u1ec3 chuy\u1ec3n nh\u00e0, gi\u1ea3i tr\u00ed hay l\u00e0m vi\u1ec7c, \u0111\u1ec1u l\u00e0m thay \u0111\u1ed5i c\u01a1 b\u1ea3n 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 v\u00e0 k\u1ef9 thu\u1eadt l\u00e1i xe l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft cho s\u1ef1 an to\u00e0n. Ki\u1ebfn th\u1ee9c n\u00e0y \u0111\u1ea3m b\u1ea3o r\u01a1-mo\u00f3c \u0111\u01b0\u1ee3c c\u1ed1 \u0111\u1ecbnh v\u00e0 ki\u1ec3m so\u00e1t \u0111\u00fang c\u00e1ch, ng\u0103n ch\u1eb7n c\u00e1c t\u00ecnh hu\u1ed1ng nguy hi\u1ec3m nh\u01b0 r\u01a1-mo\u00f3c b\u1ecb l\u1eafc ho\u1eb7c kh\u00f4ng th\u1ec3 d\u1eebng l\u1ea1i, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn m\u1ed9t v\u1ee5 va ch\u1ea1m nghi\u00eam tr\u1ecdng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"trailer-equipment-loading\">Thi\u1ebft b\u1ecb v\u00e0 Ch\u1ea5t h\u00e0ng<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc khi k\u00e9o, m\u1ed9t ng\u01b0\u1eddi l\u00e1i xe ph\u1ea3i \u0111\u1ea3m b\u1ea3o 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 ch\u1ea5t l\u00ean \u0111\u00fang c\u00e1ch. N\u1ebfu kh\u00f4ng l\u00e0m nh\u01b0 v\u1eady c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn h\u1ecfng h\u00f3c c\u01a1 kh\u00ed ho\u1eb7c m\u1ea5t ki\u1ec3m so\u00e1t.<\/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 ph\u00f9 h\u1ee3p v\u1edbi tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a r\u01a1-mo\u00f3c. N\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c g\u1eafn ch\u1eafc ch\u1eafn v\u00e0o khung c\u1ee7a xe k\u00e9o. Bi m\u00f3c k\u00e9o v\u00e0 kh\u1edbp n\u1ed1i ph\u1ea3i c\u00f3 c\u00f9ng k\u00edch th\u01b0\u1edbc v\u00e0 \u0111\u01b0\u1ee3c ch\u1ed1t \u0111\u00fang c\u00e1ch.<\/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 ch\u1eafc ch\u1eafn \u0111\u1ec3 n\u1ed1i r\u01a1-mo\u00f3c v\u1edbi xe k\u00e9o. C\u00e1c d\u00e2y x\u00edch ph\u1ea3i \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;. \u0110i\u1ec1u n\u00e0y ng\u0103n l\u01b0\u1ee1i r\u01a1-mo\u00f3c r\u01a1i xu\u1ed1ng \u0111\u1ea5t n\u1ebfu m\u00f3c k\u00e9o b\u1ecb h\u1ecfng v\u00e0 gi\u00fap duy tr\u00ec m\u1ed9t ph\u1ea7n kh\u1ea3 n\u0103ng \u0111i\u1ec1u khi\u1ec3n l\u00e1i. C\u00e1c d\u00e2y x\u00edch n\u00ean c\u00f3 \u0111\u1ee7 \u0111\u1ed9 ch\u00f9ng \u0111\u1ec3 cho ph\u00e9p c\u00e1c c\u00fa r\u1ebd g\u1ea5p nh\u01b0ng kh\u00f4ng qu\u00e1 nhi\u1ec1u \u0111\u1ebfn m\u1ee9c ch\u00fang k\u00e9o l\u00ea tr\u00ean m\u1eb7t \u0111\u1ea5t.<\/li>\n\n\n\n<li><strong>\u0110\u00e8n:<\/strong> H\u1ec7 th\u1ed1ng chi\u1ebfu s\u00e1ng c\u1ee7a r\u01a1-mo\u00f3c ph\u1ea3i \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi xe k\u00e9o v\u00e0 ho\u1ea1t \u0111\u1ed9ng \u0111\u1ea7y \u0111\u1ee7. \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 xe k\u00e9o. C\u0169ng c\u1ea7n c\u00f3 m\u1ed9t \u0111\u00e8n tr\u1eafng \u0111\u1ec3 chi\u1ebfu s\u00e1ng bi\u1ec3n s\u1ed1.<\/li>\n\n\n\n<li><strong>Phanh r\u01a1-mo\u00f3c:<\/strong> T\u1ea1i Pennsylvania, m\u1ed9t r\u01a1-mo\u00f3c ph\u1ea3i \u0111\u01b0\u1ee3c trang b\u1ecb h\u1ec7 th\u1ed1ng phanh ri\u00eang n\u1ebfu t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u00f3 l\u00e0 <strong>3.000 pound tr\u1edf l\u00ean<\/strong>, ho\u1eb7c n\u1ebfu t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u00f3 l\u1edbn h\u01a1n 40% t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a xe k\u00e9o. C\u00e1c phanh n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1edfi m\u1ed9t b\u1ed9 \u0111i\u1ec1u khi\u1ec3n phanh \u0111i\u1ec7n t\u1eed trong cabin c\u1ee7a xe k\u00e9o.<\/li>\n<\/ul>\n<\/div>\n\n\n<\/p>\n\n\n\n<div class=\"gb-element-3735b8d6\">\n<span class=\"gb-shape gb-shape-d1a7541a\"><svg viewBox=\"0 0 16 16\" class=\"bi bi-bookmark-star\" fill=\"currentColor\" height=\"16\" width=\"16\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n  <path d=\"M7.84 4.1a.178.178 0 0 1 .32 0l.634 1.285a.18.18 0 0 0 .134.098l1.42.206c.145.021.204.2.098.303L9.42 6.993a.18.18 0 0 0-.051.158l.242 1.414a.178.178 0 0 1-.258.187l-1.27-.668a.18.18 0 0 0-.165 0l-1.27.668a.178.178 0 0 1-.257-.187l.242-1.414a.18.18 0 0 0-.05-.158l-1.03-1.001a.178.178 0 0 1 .098-.303l1.42-.206a.18.18 0 0 0 .134-.098z\"><\/path>\n  <path d=\"M2 2a2 2 0 0 1 2-2h8a2 2 0 0 1 2 2v13.5a.5.5 0 0 1-.777.416L8 13.101l-5.223 2.815A.5.5 0 0 1 2 15.5zm2-1a1 1 0 0 0-1 1v12.566l4.723-2.482a.5.5 0 0 1 .554 0L13 14.566V2a1 1 0 0 0-1-1z\"><\/path>\n<\/svg><\/span>\n\n\n\n<p class=\"gb-text\">\ud83d\udd12 \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\/pennsylvania\/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>K\u00e9o r\u01a1-mo\u00f3c, d\u00f9 \u0111\u1ec3 chuy\u1ec3n nh\u00e0, gi\u1ea3i tr\u00ed hay l\u00e0m vi\u1ec7c, \u0111\u1ec1u l\u00e0m thay \u0111\u1ed5i c\u01a1 b\u1ea3n 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 v\u00e0 k\u1ef9 thu\u1eadt l\u00e1i xe l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft cho s\u1ef1 an to\u00e0n. Ki\u1ebfn th\u1ee9c n\u00e0y &#8230; <a title=\"Ch\u01b0\u01a1ng 12: K\u00e9o r\u01a1-mo\u00f3c\" class=\"read-more\" href=\"https:\/\/testsdmv.com\/vi\/study-guides\/pennsylvania\/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":55927,"menu_order":12,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-60891","page","type-page","status-publish","has-post-thumbnail"],"_links":{"self":[{"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/pages\/60891","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=60891"}],"version-history":[{"count":0,"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/pages\/60891\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/pages\/55927"}],"wp:attachment":[{"href":"https:\/\/testsdmv.com\/vi\/wp-json\/wp\/v2\/media?parent=60891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}