Privacy

What we collect: nothing about you.

This site has no accounts, no sign-in, no forms, no advertising and sets no cookies. Your view settings travel in the page address (for example ?theme=light), not in anything stored on your device.

The site is served by Cloudflare, Inc. from our own account. Like any web host, Cloudflare processes the connection data needed to deliver a page to you, such as your IP address and browser type, under its own privacy policy (cloudflare.com/privacypolicy). We see aggregate request counts from Cloudflare's dashboard and nothing that identifies you. For the pages we also see aggregate visit statistics: Cloudflare Web Analytics, which Cloudflare adds to each page as it is served, counts visits and page views without cookies and without building a profile of you. We don't run advertising or trackers.

The map tiles are served from our own storage on Cloudflare; no third-party map or tile provider receives your requests. The transit data on the page is fetched by our servers, not by your browser, so the Chicago Transit Authority does not receive any request from you.

No data about visitors leaves Cloudflare, and none is sold, shared or used for advertising. If that ever changes, this page changes first.

Questions: zach@commonsignaldata.com.

This page: 2026-10-23.