Where every fact comes from.

Sources we cite

The single most important source for every state's content is that state's official driver manual, published by its DMV (or that state's equivalent: RMV in Massachusetts, MVD in New Mexico, DDS in Georgia, and so on). Every state-specific number on this site, the passing score, the BAC limit, the GDL stage rules, the fees, the following-distance count, comes from that manual.

You'll see citations in two places:

• On every state-fact page, next to the value itself. The link goes directly to the state's official driver manual (usually a PDF). Example: Oregon state facts.
• On every practice question, the rationale ties back to the rule in the manual that the question is testing.

When a state updates its manual (new edition, law change, new sign), the citation is what tells us where to look first.

Why state-by-state matters

A "DMV practice test" book that promises to cover all 50 states is promising something it can't deliver. The format of the test, the passing score, the number of questions, the fees, and dozens of specific rules vary by state:

• Passing scores range from 70% to 86% depending on the state.
• Some states test 20 questions, others 25, others 40 or more.
• Following-distance rules, headlight-dim distances, and school-bus stopping rules are written differently in different manuals.
• Graduated-license (GDL) rules for teens vary in nearly every detail: hours required, supervised-driving minimums, passenger limits, curfews.

Generic prep can give you the federal-MUTCD signs and the broad concepts, then leave you to guess at the specifics. We don't do that. Every state gets its own guide, written against its own manual.

How currency is maintained

Driver manuals get republished. Laws change. A page that's right this year might be wrong next year. Two things keep the site current:

• Visible last-verified dates. State-fact pages show when each value was last verified against its source. That date is on the page next to the citation, not buried in metadata.
• Manual-change re-verification. When a state publishes a new edition of its driver manual, the affected facts get re-checked against the new edition and the verification date updates. If a value moved, the page changes with it.

The site's sitemap exposes lastmod dates per page so search engines see fresh content the moment it's updated.

Practice questions and rationales

Every practice question carries a rationale: not just "B is correct," but the underlying rule from the manual that makes B correct, plus why the wrong choices are wrong. If a question is state-specific, the rationale ties to the state's manual; if it's universal (MUTCD signs, basic right-of-way), the rationale ties to the corresponding federal rule.

The goal is to make the site usable as standalone study material without ever feeling like a multiple-choice trivia drill. You should finish a question knowing the rule, not just the letter.

The author byline

The series is written by Robert Nolan. One name on every state guide, one name on the editorial pages here. If you want to know who's accountable for a claim, that's who.

Spotting an error

If you find something on this site that's contradicted by your state's manual, please tell us. State law and signage do change, and a misprint that reaches a real reader is worth catching fast. Send a correction. The citation on the page will tell you (and us) exactly where to look to confirm.

Where to dig in

• Every state we cover, with the state-specific guides, signs, and practice questions.
• A representative state-facts page so you can see the citation discipline in practice.
• Glossary of knowledge-test terminology, from "BAC" to "implied consent" to "right of way," in plain English.