Flooded Roadway Warning System
Since April 25, 2000, the City of Dallas has run a network of solar-powered sensors at low-water crossings that automatically activate roadside warning signs when floodwater reaches the roadway. Each site reports water level to a central computer roughly every 20 minutes; when a float switch detects the road is submerged, the sign switches from a static 'High Water When Flashing' notice to an actively flashing 'Do Not Enter High Water' warning, and the system pages Street Services staff to deploy barricades. The network has grown incrementally since 2000 — press coverage from 2015 and flood events into 2025 both describe it as actively operating, with a live status page (fc.dallascityhall.com) showing which sites are currently in alarm.
📖 Terms in this entry: Adaptive traffic signals · Digital twin · LoRaWAN
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📎 Cite this project
1001 Smart Cities (2026). “Flooded Roadway Warning System” — Dallas, United States. The Smart City Atlas. https://1001smartcities.org/projects/dallas-flooded-roadway-warning-system/ (last verified 2026-08-02). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.