法规速查Regulation Navigator
先看懂要求，再查清依据。Understand the rule. Find its source.
部分资料含历史版本或来源限制。收录日期不代表现行性已复核；请先核对每项官方来源、版本和适用范围。Some records contain historical versions or source limitations. Capture dates do not establish a review of current requirements; check each official source, edition and scope before use.
法规索引Regulation index
按中文名称了解每条管什么，再展开查看解读与官方原文。Browse by subject, then expand an entry for available explanations and official text.
轮胎要求§ 393.75 Tires.§ 393.75 Tires.轮胎要求
适用于联邦 Part 393 覆盖的货车和牵引车。本文选择常见检查项目，不替代完整出车检查、维修标准或特定车辆例外。For trucks and truck tractors covered by federal Part 393. These are common inspection points, not a replacement for the full pre-trip inspection, maintenance requirements or vehicle-specific exceptions.
轮胎同时看损伤、花纹、载荷和气压Check tire damage, tread, loading and inflation
- 具体要求What the rule requires
- 轮胎露出帘布或带束层、胎面或胎壁分离、瘪胎，或有可听见的漏气等情况时，不得继续运行。货车／牵引车前轮的主要胎纹沟深至少为 4/32 英寸，其他轮胎一般至少为 2/32 英寸；测量时须避开连筋等位置。同时应检查额定载荷，以及适合实际载荷的冷胎气压。Do not operate on tires with exposed ply/belt material, tread or sidewall separation, a flat or an audible leak. Major tread grooves on truck/tractor front tires must be at least 4/32 inch deep; other tires generally need 2/32 inch, measured away from tie bars and similar features. Also check load ratings and cold inflation appropriate to the load.
(a) (a) No motor vehicle shall be operated on any tire that—
(a)(1) (1) Has body ply or belt material exposed through the tread or sidewall,
(a)(2) (2) Has any tread or sidewall separation,
(a)(3) (3) Is flat or has an audible leak, or
(a)(4) (4) Has a cut to the extent that the ply or belt material is exposed.
(b) (b) Any tire on the front wheels of a bus, truck, or truck tractor shall have a tread groove pattern depth of at least 4/32 of an inch when measured at any point on a major tread groove. The measurements shall not be made where tie bars, humps, or fillets are located.
(c) (c) Except as provided in paragraph (b) of this section, tires shall have a tread groove pattern depth of at least 2/32 of an inch when measured in a major tread groove. The measurement shall not be made where tie bars, humps or fillets are located.
(g) (g) Tire loading restrictions (except on manufactured homes). No motor vehicle (except manufactured homes, which are governed by paragraph (h) of this section) shall be operated with tires that carry a weight greater than that marked on the sidewall of the tire or, in the absence of such a marking, a weight greater than that specified for the tires in any of the publications of any of the organizations listed in Federal Motor Vehicle Safety Standard No. 119 (49 CFR 571.119, S5.1(b)) unless:
(h)(2)(i) (i) Tire inflation pressure. (1) No motor vehicle shall be operated on a tire which has a cold inflation pressure less than that specified for the load being carried.
使用固定来源版次；适用日期与例外以原文及历史沿革为准。Uses a fixed source edition; check the original and statutory history for operative dates and exceptions.
法规原文 · 英文REGULATION TEXT · ENGLISH
轮胎要求§ 393.75 Tires.
官方来源快照；不代表已核对现行汇编及后续修订。请核对来源版本。Official-source snapshot; current consolidated law and subsequent amendments have not been verified.
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依据关联的官方原文及官方项目说明起草。中文和英文解读均为 CTAC AI 辅助工作稿，未经人工审核；教学案例不是实际会员记录。采集日期不是法规生效日期。Drafted from linked official texts and agency guidance. Both language interpretations are CTAC AI-assisted drafts pending human review; examples are illustrative, not member records. Capture dates are not legal effective dates.
车灯正常工作与反光装置不受遮挡§ 393.9 Lamps operable, prohibition of obstructions of lamps and reflectors.§ 393.9 Lamps operable, prohibition of obstructions of lamps and reflectors.车灯正常工作与反光装置不受遮挡
适用于联邦 Part 393 覆盖的货车和牵引车。本文选择常见检查项目，不替代完整出车检查、维修标准或特定车辆例外。For trucks and truck tractors covered by federal Part 393. These are common inspection points, not a replacement for the full pre-trip inspection, maintenance requirements or vehicle-specific exceptions.
所需灯光须正常工作，反光装置也须保持可见Required lights must work and remain visible
- 具体要求What the rule requires
- 本分部要求的灯具须能正常工作。所要求的灯具、反光器和反光材料，不得被车板、货物、遮盖物或污物挡住。检查时应实际测试功能并查看可见性，仅看灯壳是否完好还不够。Lamps required by the subpart must operate, and required lamps, reflectors and reflective material must not be obscured by bodywork, loads, coverings or dirt. Check operation and visibility, not merely whether the housing looks intact.
- 条件与例外Conditions and exceptions
- 条文为前端保护装置上的特定反光标识规定了例外，该例外不表示可以遮挡所有反光装置。The specified exception for conspicuity treatment on front-end protection devices does not permit covering all reflectors.
(a) (a) All lamps required by this subpart shall be capable of being operated at all times. This paragraph shall not be construed to require that any auxiliary or additional lamp be capable of operating at all times.
(b) (b) Lamps and reflective devices/material required by this subpart must not be obscured by the tailboard, or by any part of the load, or its covering by dirt, or other added vehicle or work equipment, or otherwise. Exception: The conspicuity treatments on the front end protection devices may be obscured by part of the load being transported.
使用固定来源版次；适用日期与例外以原文及历史沿革为准。Uses a fixed source edition; check the original and statutory history for operative dates and exceptions.
法规原文 · 英文REGULATION TEXT · ENGLISH
车灯正常工作与反光装置不受遮挡§ 393.9 Lamps operable, prohibition of obstructions of lamps and reflectors.
官方来源快照；不代表已核对现行汇编及后续修订。请核对来源版本。Official-source snapshot; current consolidated law and subsequent amendments have not been verified.
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依据关联的官方原文及官方项目说明起草。中文和英文解读均为 CTAC AI 辅助工作稿，未经人工审核；教学案例不是实际会员记录。采集日期不是法规生效日期。Drafted from linked official texts and agency guidance. Both language interpretations are CTAC AI-assisted drafts pending human review; examples are illustrative, not member records. Capture dates are not legal effective dates.
动力车辆应配备的应急设备§ 393.95 Emergency equipment on all power units.§ 393.95 Emergency equipment on all power units.动力车辆应配备的应急设备
适用于联邦 Part 393 覆盖的货车和牵引车。本文选择常见检查项目，不替代完整出车检查、维修标准或特定车辆例外。For trucks and truck tractors covered by federal Part 393. These are common inspection points, not a replacement for the full pre-trip inspection, maintenance requirements or vehicle-specific exceptions.
按运输业务选择应急设备，并正确固定Match emergency equipment to the operation
- 具体要求What the rule requires
- 未用于运送危险品的动力车辆，通常至少配备一只 5 B:C 灭火器，或两只各为 4 B:C 的灭火器；运输达到贴牌数量的危险品时，动力车辆至少须配 10 B:C 灭火器。灭火器须充装充足、方便取用并牢固固定。警示装置可选择三只合格的双向反光三角牌，普通手电不能作为法定替代品。A power unit not used to transport hazardous materials generally needs one extinguisher rated at least 5 B:C or two rated at least 4 B:C each; a power unit carrying placardable hazardous materials needs at least 10 B:C. Keep extinguishers charged, accessible and securely mounted. Three compliant bidirectional reflective triangles are a permitted warning-device option; an ordinary flashlight is not a substitute.
- 条件与例外Conditions and exceptions
- 本条有 driveaway-towaway 等例外，并对特定危险品和燃气车辆携带火焰警示装置作限制。This section includes driveaway-towaway exceptions and restricts flame-producing warning devices on specified hazardous-material and compressed-gas vehicles.
Each truck, truck tractor, and bus (except those towed in driveaway-towaway operations) must be equipped as follows:
(a) (a) Fire extinguishers—(1) Minimum ratings. (i) A power unit that is used to transport hazardous materials in a quantity that requires placarding (See § 177.823 of this title) must be equipped with a fire extinguisher having an Underwriters' Laboratories rating of 10 B:C or more.
(ii) A power unit that is not used to transport hazardous materials must be equipped with either:
(A) A fire extinguisher having an Underwriters' Laboratories rating of 5 B:C or more; or
(B) Two fire extinguishers, each of which has an Underwriters' Laboratories rating of 4 B:C or more.
(2) Labeling and marking. Each fire extinguisher required by this section must be labeled or marked by the manufacturer with its Underwriters' Laboratories rating.
(3) Visual Indicators. The fire extinguisher must be designed, constructed, and maintained to permit visual determination of whether it is fully charged.
(4) Condition, location, and mounting. The fire extinguisher(s) must be filled and located so that it is readily accessible for use. The extinguisher(s) must be securely mounted to prevent sliding, rolling, or vertical movement relative to the motor vehicle.
(5) Extinguishing agents. The fire extinguisher must use an extinguishing agent that does not need protection from freezing. Extinguishing agents must comply with the toxicity provisions of the Environmental Protection Agency's Significant New Alternatives Policy (SNAP) regulations under 40 CFR Part 82, Subpart G.
(6) Exception. This paragraph (a) does not apply to the driven unit in a driveaway-towaway operation.
(f) (f) Warning devices for stopped vehicles. Except as provided in paragraph (g) of this section, one of the following options must be used:
(f)(1) (1) Three bidirectional emergency reflective triangles that conform to the requirements of Federal Motor Vehicle Safety Standard No. 125, § 571.125 of this title; or
(f)(2) (2) At least 6 fusees. The vehicle must have as many additional fusees as are necessary to satisfy the requirements of § 392.22 of this chapter.
(f)(3) (3) Other warning devices may be used in addition to, but not in lieu of, the required warning devices, provided those warning devices do not decrease the effectiveness of the required warning devices.
(g) (g) Restrictions on the use of flame-producing devices. Fusees or any other signal produced by a flame shall not be carried on any commercial motor vehicle transporting Division 1.1, 1.2, 1.3 (explosives) hazardous materials; any cargo tank motor vehicle used for the transportation of Division 2.1 (flammable gas) or Class 3 (flammable liquid) hazardous materials whether loaded or empty; or any commercial motor vehicle using compressed gas as a motor fuel.
使用固定来源版次；适用日期与例外以原文及历史沿革为准。Uses a fixed source edition; check the original and statutory history for operative dates and exceptions.
法规原文 · 英文REGULATION TEXT · ENGLISH
动力车辆应配备的应急设备§ 393.95 Emergency equipment on all power units.
官方来源快照；不代表已核对现行汇编及后续修订。请核对来源版本。Official-source snapshot; current consolidated law and subsequent amendments have not been verified.
展开英文原文Read the English original收起英文原文Hide the English original
正在加载本条英文原文…Loading this English original…
依据关联的官方原文及官方项目说明起草。中文和英文解读均为 CTAC AI 辅助工作稿，未经人工审核；教学案例不是实际会员记录。采集日期不是法规生效日期。Drafted from linked official texts and agency guidance. Both language interpretations are CTAC AI-assisted drafts pending human review; examples are illustrative, not member records. Capture dates are not legal effective dates.
中文为 CTAC 白话说明，不是官方译文，也不构成个案法律意见。请先核对适用范围、来源版本与最新官方通知。CTAC plain-language explanations are not official translations or case-specific legal advice. Check scope, source editions and current official notices.