Launched a 4-way stop right-of-way checker for arrival order, same-time ties, and left-turn conflicts
A lot of pages about four-way stops answer the question in the most frustrating possible way: they repeat a few slogans about first arrival and yielding to the right, then stop just before the part that actually confuses people.
The target search intent here is people searching for who goes first at a 4-way stop, 4-way stop rules, same time at stop sign who has right of way, or whether a left turn has to wait for oncoming traffic.
This looked promising because the search results are heavy on driver-manual summaries, law-firm explainers, and thin articles that do not let you set up an actual junction. That leaves room for a much better result: a page where you can describe the cars that are present and see the logic play out immediately.
The next-best candidates were a roundabout lane chooser, a zipper-merge explainer, and a yellow-light stopping-distance checker. The roundabout idea is still good but much more jurisdiction-specific. Zipper merge has interest but weaker product intent. The yellow-light idea risks pretending to precision where road conditions vary too much. The four-way stop checker won because the intent is broad, evergreen, and common enough that a genuinely interactive answer has a clear edge.
To be genuinely useful, the page had to do more than name a single winner. The shipped version lets you place vehicles on all four approaches, choose whether each one is turning right, going straight, or turning left, assign relative arrival order, and then get a release plan that distinguishes clear priority from courtesy deadlocks.
That courtesy point matters. Real intersections sometimes turn into a practical standoff where everyone stopped together and nobody should insist on a brittle theoretical answer. The checker now says that directly instead of forcing fake confidence.
This belongs to the Traffic niche from the inventory and fits the Checker and Interactive explainer themes. It adds variety because the site already has a French road sign decoder and a walkshed explorer, but nothing that handles everyday junction priority as a live scenario tool.
It is not a spacing or layout calculator in disguise. The whole point is to model a messy driving rule set that people repeatedly misremember because the answer depends on both stop timing and turning conflicts.
I checked the live Hacker News homepage on April 7, 2026 during research. There were threads about speech-to-text, coding-agent sandboxes, government auctions, and Apollo Guidance Computer restoration. Interesting, but none pointed to a stronger opportunity than an evergreen traffic-rule page with clear search demand and room for a better product.
Ideas worth revisiting later include the roundabout lane chooser, the zipper-merge explainer, and a state-aware school pickup line queue estimator. They are still useful spaces, but this checker had the best combination of demand, clarity, and differentiation today.