Distinguish disabled parked and unlit vehicles

By Jacob Alford

A disabled vehicle, an unlawfully parked vehicle and a temporarily stopped vehicle are not interchangeable. Lighting and opening a door can raise separate issues. In particular, the statute cited for disabled-in-lane factor 14 contains a disabled-vehicle exception. Preserve why the vehicle stopped, whether it could be moved, the setting and the sequence.

Questions this group helps answer:

• Can a disabled vehicle contribute without being illegally parked?
• Which rules apply to a vehicle stopped in the travel lane?
• When do parked vehicles need lights?
• How is not using headlights different from a defective light?
• What if an open door or an unset parking brake contributed?

14. Disabled in traffic lane

Meaning in the report: A unit was actually disabled in a traffic lane on the main traveled highway and its presence contributed to the crash.

What needs explaining: Establish genuine disablement and its causal role. What caused the disablement, when did it occur, and could the vehicle be moved?

Limits and qualifications: A disabled vehicle can contribute without violating §545.301. Check the location, whether moving off the roadway was possible, and whether the stop was temporary. Subsection (b) also contains waste-service and tow-truck exceptions.

Related law and scope: Section 545.301(a) concerns stopping, standing or parking on the main traveled highway outside a business or residence district. Section 545.301(b)(1) expressly excludes a vehicle disabled there when it is impossible to avoid stopping and temporarily leaving it there.

Sources: TxDOT definition, page 137; Transportation §545.301.

21. Drove without headlights

Meaning in the report: Failure to use headlights when lighting conditions or time required them contributed to the crash.

What needs explaining: This is about use of lights, not a general examination of vehicle-defect codes. Were the lights off, what were the visibility conditions, and did that affect seeing or being seen?

Limits and qualifications: Apply the statute’s actual nighttime and visibility triggers rather than assuming headlights are legally required in every unfavorable condition.

Related law and scope: Required lamps must be lit at nighttime or when insufficient light/unfavorable atmosphere makes a person or vehicle not clearly discernible 1000 feet ahead. Nighttime is defined in §541.401(5) as half an hour after sunset to half an hour before sunrise.

Sources: TxDOT definition, page 137; Transportation §547.302(a); Transportation §541.401(5) (related provision); Transportation §547.801(d) (related provision).

Further care: The legal trigger is more precise than the manual’s broad safe-operation wording. Motorcycles have an additional at-all-times headlamp rule, with a pre-1975 exception, in §547.801(d).

51. Opened door into traffic lane

Meaning in the report: An open vehicle door in a traffic lane contributed to the crash.

What needs explaining: Determine when and how the door was opened and what traffic was affected. Was the door opened into moving traffic, was it left open, and could the user observe an approaching road user?

Limits and qualifications: Statutory duties include safety and how long the door remains open; the label alone does not identify who opened it.

Related law and scope: Subsection (1) prohibits opening a motor-vehicle door on the moving-traffic side unless reasonably safe and without interference. Subsection (2) limits how long a traffic-side door may remain open to the time needed for passenger loading/unloading.

Sources: TxDOT definition, page 140; Transportation §545.418.

Further care: The statute does not prohibit every traffic-side door opening. The manual’s causal door-opening description is broader than proof of the offense.

54. Parked and failed to set brakes

Meaning in the report: Failure to set the brake on a parked, unattended vehicle contributed.

What needs explaining: Establish that the vehicle was unattended and that the missing brake application mattered. Was the vehicle left unattended, were the brakes set, and was grade or wheel position relevant?

Limits and qualifications: Do not confuse failure to apply a brake with a mechanical brake defect.

Related law and scope: An operator leaving a vehicle unattended must set the parking brake effectively. Subsection (a)(5) additionally requires turning front wheels toward the curb/side on a grade.

Sources: TxDOT definition, page 141; Transportation §545.404(a)(4); Transportation §545.404(a)(5),(b) (related provision).

Further care: The remote-starter exception in (b) exempts only (a)(1)–(3), not the brake or grade-wheel requirements.

55. Parked in traffic lane

Meaning in the report: A vehicle was stopped, standing or parked unlawfully in a way that contributed.

What needs explaining: The definition requires an unlawful position, unlike code 14’s actual disablement. Why was the vehicle stopped, where was it, what exceptions applied and what road space remained?

Limits and qualifications: The relevant rule depends on road type and location; disability and safety exceptions matter.

Related law and scope: The laws distinguish outside-business/residence main-road parking, prohibited places, temporary passenger/merchandise stops, wheel alignment, one-way roads and local parking permissions.

Sources: TxDOT definition, page 141; Transportation §545.301(a); Transportation §545.302; Transportation §545.303; Transportation §545.301(b) (related provision); Transportation §541.401(6),(9),(10) (related provision).

Further care: Read §545.301(b)’s disabled/waste/tow exceptions even though the manual cites only (a); §545.302(f) excludes necessary traffic-conflict avoidance and compliance with law/police/devices. Do not classify every vehicle momentarily stopped in traffic as illegal parking.

56. Parked without lights

Meaning in the report: A parked vehicle lacked legally required lights and that contributed.

What needs explaining: The manual ties the code to a violation of the specific parked-vehicle lighting statute. Was it nighttime, was the vehicle lawfully parked and was ambient lighting enough to reveal it?

Limits and qualifications: Do not assume every parked vehicle must display lights under all conditions.

Related law and scope: Subsection (b) generally requires the specified front/rear lamps for a vehicle stopped/parked on a roadway or shoulder at §547.302(a) times. Subsection (a) defines lamps; (c) excuses a lawfully parked highway vehicle at night when 1000-foot visibility exists; (d) requires parked headlamps dimmed.

Sources: TxDOT definition, page 141; Transportation §547.383; Transportation §547.302(a) (related provision).

Further care: Subsections (a)–(b) exclude mopeds and motorcycles with engine displacement 250 cc or less. The factor explicitly requires a violation of §547.383; apply those exceptions and visibility facts.

Attorney reviewed by Jacob Alford · November 11, 2026