The five-minute Stop Sign or Traffic Signal Warrant analysis
A signal request lands on your desk. Answer it with all nine MUTCD warrants plus the stop-control question, run from counts you already have - and hand back a PE-sealed PDF at the end. In-browser. In minutes.
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From “residents are complaining” to a defensible answer
A resident complains about the side street. A council member forwards a petition for a stop sign. A developer's study lands on your desk. The question is always the same: what control does this intersection actually need? TraffIQ runs the full decision chain from the same turning-movement data: how bad the side street is today, whether the all-way stop is coping, and whether an all-way stop or a signal is warranted.
Signal Warrants
All nine MUTCD 11th Edition warrants in one pass. Each returns MET, NOT MET, or REQUIRES JUDGMENT, with the controlling condition and the numbers behind it.
Multi-Way Stop Control
The five MWSC criteria (MUTCD Sections 2B.13–2B.17) answer the upstream question: is an all-way stop justified here at all?
AWSC Analysis
HCM Chapter 21 control delay and LOS for an existing or proposed all-way stop. Every lane, every approach, the whole intersection. Is the all-way stop still doing its job?
TWSC Analysis
HCM Chapter 20 gap-acceptance delay for the side street at a two-way stop. Graded exactly as the standard defines (minor street only), with intersection-wide delay for comparison.
Four modules, one project, one license. Results carry across: your warrant analyses and your LOS studies cite the same counts, in the same project, with the same audit trail. And every engine ships validated line-by-line against its source chapter - HCM equations, MUTCD criteria - before release.
Field to browser, near real-time
Game|Changer - Rhythm Engineering's AI-powered data collection system - counts turning movements, pedestrians, and bikes in the field and pushes the data to the cloud every 15 minutes. Open your TraffIQ project and the counts are waiting, labeled with collection date, agency, and origin system. No field unit? Import a TMC CSV or enter counts manually.
Setup is once, not per study: link your organization to your Game|Changer, then pull any date’s counts straight into the study.
Either way, the 30–50% of study hours that used to go to data wrangling go back to billable analysis.
Every number shows its work
Every determination traces to a published MUTCD or HCM figure, table, or rule. Open any warrant and see the conditions evaluated side by side, thresholds printed in the open, every rolling hour listed with its pass/fail. Short counts get flagged before they become a problem in review. The MUTCD's own advisory stays on screen: warrant satisfaction alone does not require a signal - the engineering study decides. And a Methodology reference sits one click away, in every module.
| Hour | Major | Minor | ≥500 | ≥150 |
|---|---|---|---|---|
| 07:15–08:15 | 785 | 1,518 | Yes | Yes |
| 07:30–08:30 | 918 | 1,586 | Yes | Yes |
| 08:00–09:00 | 1,075 | 1,627 | Yes | Yes |
| 20:00–21:00 | 468 | 789 | No | Yes |
The deliverable is a defensible PDF
Every module ends the same way: a print-ready, agency-formatted PDF with the full supporting tables and count provenance. A study that cannot show its work gets kicked back - and re-review costs weeks. TraffIQ reports carry their evidence with them. Apply your PE seal and the report and the underlying study become immutable. Nobody edits a sealed study, including you. Licensed in more than one state? Seal under whichever license applies - the report records that license’s state and number.
Reports carry your organization’s branding - your logo and color preferences - so what lands on the reviewer’s desk is your firm’s work.
And because two-way and all-way stop results share the same delay scale, the “what should we do instead?” comparison is already in your hand.
IMMUTABLE
Same standards. A different way of working.
The warrant math is published in the MUTCD and the HCM - nobody owns it, and the established desktop tools compute it correctly. What differs is everything around the math: how the work is delivered, shared, and defended.
| The desktop way | The TraffIQ way | |
|---|---|---|
| Counts in | ✕Count data exported from one tool, reformatted, and re-typed into another | ✓Game|Changer counts flow in automatically - or import your turning-movement counts, or enter them by hand |
| Platform | ✕Windows desktop installs, licensed per workstation | ✓Browser-native: any OS, nothing to install, one per-seat subscription |
| Modules | ✕Warrant analysis sold as a separate add-on module | ✓All four analysis modules in every license: Signal Warrants, MWSC, AWSC, TWSC |
| Team workflow | ✕Single-user and file-based - studies get emailed around for review | ✓Technician, engineer and admin roles in one shared project, with a full audit trail |
| Report archive | ✕Editable PDFs scattered across local folders | ✓PE-sealed, checksummed and immutable; unsealed drafts watermarked UN-SEALED and flattened |
| MUTCD edition | ✕Varies by tool - some current, some still on 2009 | ✓11th Edition (2023), with 2009 legacy support |
| Updates | ✕Patch installers, version by version, machine by machine | ✓Continuous - every login is the current version |
| Trying it | ✕Quotes, POs and installs before you can even try it | ✓A 30-day evaluation starts the moment you register - no credit card, no sales call |
Don’t take our word for it
TraffIQ is new. Our track record isn't - Rhythm Engineering has been shipping traffic engineering systems to agencies since 2005, and the same team that built In|Sync® adaptive signal control and Game|Changer field data built this. We don't ask you to take the engine on faith either. The methodology is documented inside every module, every threshold cites its source, and identical inputs always produce identical results.
Built by engineers who've sat in your chair
TraffIQ is built by Rhythm Engineering, led by Reggie Chandra, Ph.D., PE - a practicing traffic engineer before he was a CEO. The products come from the same place the problems do: agencies asking for signal justifications, stop-sign petitions, and studies that survive review. In|Sync® (2007) rewired how corridors adapt to traffic. Game|Changer (2018) rewired how field data gets collected. TraffIQ closes the loop: from counts in the field to a sealed study on the reviewer's desk.
One license. One price. Every module.
No feature tiers, no per-module pricing, no surprises at renewal.
The next intersection question is already in someone's inbox.
Answer it with a study you can stand behind: the right analysis, the evidence attached and sealed.
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