Clear the way, before the siren arrives.
SALROW is a cloud-native predictive routing system that warns the right civilian drivers — at the right moment — when an ambulance, fire truck, or police vehicle is heading their way.
- No hardware
- Smartphone-only
- Targeting
- Risk-scored
- Privacy
- Ephemeral
Sirens stopped being enough a decade ago.
Modern cars are sound-insulated. Drivers wear earbuds and watch navigation. Crowdsourced reports lag behind reality. Every second of delayed clearance increases mortality in cardiac, trauma, stroke, and fire emergencies.
- Soundproof cabinsAcoustic insulation attenuates sirens past 30–40 ft.
- Reaction lagDrivers need seconds — not split seconds — to safely clear a lane.
- No infrastructureTraffic preemption hardware doesn't scale to arterials or side streets.
Predictive corridors
Road-network-constrained corridor generation that adapts width to speed, lane count, and density.
Risk-scored targeting
Time-to-intersection, relative velocity, and topology factors decide who actually gets pinged.
Smartphone-native
Civilian app + emergency-vehicle app. No retrofits. No roadside boxes. No municipal capex.
Six steps from siren to safety.
The SALROW pipeline runs end-to-end in under a second — from the moment an emergency vehicle activates to the moment the right civilian driver sees an alert.
- 01
Trigger & telemetry
When the siren or lights engage — or speed crosses a threshold — the in-cab app begins streaming GPS, velocity, heading, and unit type to the cloud.
- 02
Authenticated ingestion
Telemetry is validated against cryptographic fleet credentials. Spoofed feeds are rejected before any corridor is generated.
- 03
Corridor generation
The Cloud Prediction Engine projects a dynamic, road-network-constrained corridor. Width adapts to speed, lane count, and urban density.
- 04
Civilian risk scoring
For every device with a projected path intersecting the corridor, the system computes a risk score from time-to-intersection, relative velocity, directionality, and topology.
- 05
Priority-ranked dispatch
Audio-visual alerts fire only on the phones that actually need them — ranked by risk, with the highest urgency at the top.
- 06
Ephemeral cleanup
On run completion, location data is purged. Privacy is built into the lifecycle — not bolted on after.
A cloud spine that thinks ahead.
SALROW splits the work between an in-cab app, a cloud prediction engine, and civilian-side delivery — so the heavy lifting never sits on a phone.
Telemetry Ingestion Layer
High-throughput stream processing of GPS, velocity, heading, and unit metadata from enrolled fleet devices.
Road Network Graph DB
Directed graph of intersections and segments with lane count, speed limit, classification, and directionality attributes.
Corridor Generation Module
Generates dynamic predictive corridors constrained to navigable topology, with width responsive to speed and density.
Civilian Risk Scoring
Computes per-device time-to-intersection, relative-velocity, directionality, and road-topology factors.
Alert Dispatch Module
Priority-ranked push delivery to the smallest necessary set of civilian devices — never the whole region.
Authenticated Enrollment
Cryptographic tokens per fleet vehicle. Revocable, scoped, and required before any corridor is generated.
See it running live.
A walkthrough of the SALROW prototype — from emergency vehicle activation to a targeted alert landing on a civilian phone.
Emergency-side app
Trigger detection, telemetry streaming, fleet authentication.
Cloud engine
Live corridor generation and per-device risk scoring.
Civilian app
Priority-ranked, audio-visual alerts with directional context.
See SALROW running on a real prototype.
A two-app demonstration: an emergency-vehicle dashboard streaming telemetry to the cloud, and a civilian phone receiving a priority-ranked alert seconds before the vehicle arrives.
Run a pilot in your city.
SALROW is built for emergency services agencies, municipal fleets, and platform partners. Tell us about your jurisdiction and we'll be in touch.
- Chicago, Illinois — United States
- Inventor: Vamsi Gorle