Traffic monitoring for event ingress and egress is the signal that determines whether 40,000 attendees arrive on time or stack into a 90-minute parking-lot backup that makes the local news. The 2017 Las Vegas Route 91 festival, the 2022 Astroworld crowd crush, and dozens of routine large-venue parking incidents share a precondition: ingress disruption that compresses arrival timing into a smaller-than-planned window. SignalGuard's traffic signal surfaces road conditions around the venue so operators can adjust doors timing, parking guidance, and shuttle frequency before the queue forms.
What this signal monitors
The Traffic signal reports live incidents — accidents, jams, road closures, lane closures, road works, broken-down vehicles, and weather-driven hazards (fog, ice, rain, wind, flooding) — within a configurable bounding box (default 7 km) around the venue. Each incident includes its category, magnitude of delay, length in meters, expected delay in seconds, road numbers, and start/end coordinates.
Data sources
SignalGuard's trafficClient.js calls the TomTom Traffic Incident Details API v5. The free tier allows 2,500 requests per day at 5 RPS, which is operationally sufficient for most single-venue use; high-frequency multi-venue monitoring should upgrade. TomTom's incident data is sourced from a fusion of probe (anonymized GPS from connected vehicles), broadcast traffic feeds, and government incident reports — the same dataset TomTom's consumer navigation products consume. Coverage is global with strongest density in North America, Europe, and APAC metros.
How SignalGuard scores severity
Per-incident severity combines TomTom's iconCategory (the kind of incident — 8=road_closed, 1=accident, 6=jam, 11=flooding, etc.) with magnitudeOfDelay (0=unknown through 4=undefined, with 3=major being the operational red flag). Road closures and flooding escalate to critical regardless of delay. Accidents with major delay are critical; with moderate delay high; otherwise medium. Jams and lane closures scale with delay magnitude. Ice and fog escalate to medium regardless of delay because they affect crowd behavior beyond just travel time. The overall level bumps to medium at 6+ concurrent incidents and high at 12+ — incident density itself is a signal even when no single event is critical.
Use cases for event security
- Hold doors when this signal is HIGH because ingress will overflow staffed lanes. A
highseverity from concentrated jams + an accident on the primary access road means the planned 90-minute ingress window will compress to 40 minutes once the road clears. Production extends doors by 30 minutes and reroutes shuttles before the queue stacks. - Pre-event re-route to alternates. When TomTom flags a road closure or major-delay accident on the primary route 4+ hours before doors, the event social channels and SMS list publish the alternate route immediately — the difference between a planned reroute and a frustrated crowd is who knows first.
- Egress pulse management. Post-show traffic surveillance from this signal feeds the venue's egress staging — if cross-traffic on the egress route is already heavy (jams pre-existing), the venue holds the exit pulse 5–10 minutes to avoid pushing crowds into gridlock that creates safety risk on foot.
Pairs well with
- Weather monitoring — ice, fog, and heavy rain drive both traffic and weather card severity simultaneously.
- Police scanner feeds — accidents on the access road frequently appear on dispatch chatter before the incident card publishes.
- Cellular network monitoring — congested cells around a gridlocked access road compound the comms load.
Premium upgrade path
For higher refresh cadence and predictive ingress modeling, BYOK HERE Traffic, INRIX Roadway Analytics, or Waze for Cities on the Integrations page. HERE Traffic adds 30-second refresh in covered metros and lane-level guidance. INRIX adds historical baseline comparisons so you see whether today's "jam" is unusual vs. typical. Waze data is community-sourced and especially strong for last-mile and parking-area incidents.
Frequently asked questions
How wide is the traffic monitoring radius? Default is 7 km around the venue, which covers most arterial ingress routes. Enterprise customers can configure radius per event.
Does the traffic signal predict ingress timing? Not by itself — TomTom reports current incidents, not arrival forecasts. Pair with HERE or INRIX BYOK feeds for predictive ingress modeling, or use historical event-day baselines (Pro+ plans).
What incident types does SignalGuard surface? All TomTom iconCategory codes: accidents, jams, road closures, lane closures, road works, broken-down vehicles, and weather hazards (fog, rain, ice, wind, flooding).
Does this work for international events? Yes — TomTom has global coverage, with strongest density in North America, Europe, and APAC metros. Rural and emerging markets have sparser probe data.
Can I see traffic incidents on a map? Yes — every incident includes coordinates and is rendered on the Integrations page map view. See the docs hub.
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