An Independent Research Project for the Informed Commuter.
Providing accessible, legally-cited clarity on vehicle compliance, traffic laws, and commuter rights. Fact-checked against current state statutes.
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Traffic Violation Defenses
Start here for legal questions about DUI, insurance, bicycle laws, and other traffic citations.
14 reports
Vehicle Compliance
Use this hub for state vehicle code questions about emissions, insurance, and equipment requirements.
5 reports
Vehicle Maintenance
Use this hub for troubleshooting noise, vibration, fluid leaks, battery issues, and other maintenance questions.
11 reports
Commuter Rights
Use this section for questions about rentals, licensing ripple effects, and related commuter constraints.
1 report
Safety Data & Statistics
Use this section for NHTSA FARS and Census-backed crash statistics, including the year and state reports.
6 reports
Recent Publications
Newly published research reports, technical explainers, and source-cited legal summaries from the Daily Driver Advocate library.
Is It Illegal for a Cop to Hide With No Lights On?
Research on why a stationary, unlit patrol car is legal — covering Pennsylvania vehicle code parking exemptions, the objective entrapment test, VASCAR/ENRADD/radar procedure, and the federal MUTCD warning against unnecessary emergency lighting.
Is It Illegal to Drive With a Broken Tail Light?
Research on why a broken tail light violates federal FMVSS 108 and every state vehicle code — covering the 4th Amendment stop doctrine, the Heien v. North Carolina Supreme Court case, Pennsylvania inspection rejection criteria, and the hidden CAN bus cascade failure risk on modern vehicles.
Is It Illegal to Drive With a Broken Arm?
Research on why no statute names a broken arm as a driving offense — covering PennDOT's Medical Advisory Board standards under 67 Pa. Code § 83.5, the 90-day temporary-condition exception to physician reporting under 75 Pa.C.S. § 1518, careless and reckless driving exposure under §§ 3714 and 3736, the prescription-painkiller DUI trap under § 3802(d), NHTSA and AAOS medical guidance, negligence per se, Pennsylvania's 51% modified comparative negligence rule, and the Sudden Emergency Doctrine.
Where Can I Sell My Catalytic Converter?
Research on legally selling a used catalytic converter — the EPA Clean Air Act aftermarket policy that bars reselling one for reuse, the RCRA scrap metal and precious metals reclamation exemptions under 40 CFR 261.6 and 266.70, EDXRF assaying and converter grading tiers, and the state anti-theft transaction laws (illustrated by Iowa Code § 714.27A) governing the point of sale.
Why Is My Engine Light Blinking?
An independent research report on a flashing check engine light — covering the EPA/CARB Type A misfire protocol, the 200-revolution one-trip detection window, crankshaft-position misfire physics, catalytic converter meltdown thermodynamics, exhaust scavenging reversal and engine ingestion, SAE J2012 P0300-series codes, and the ASE component-swap and compression-testing diagnostic sequence.