CTA Adjusts Routes 4, 115 for Construction

CTA reroutes two South Side bus routes via King Drive due to Cottage Grove construction

CTA Reroutes Routes 4, 115 for Construction

Chicago's CTA will detour two South Side bus routes starting Tuesday due to construction on Cottage Grove, transit officials said. Routes #4 Cottage Grove and #115 Pullman/115th will see northbound service rerouted via King Drive and 107th Street between 107th and 111th streets. The service change takes effect April 7 at 6:00 AM, though officials haven't announced when the detour will end.

Construction Prompts Service Adjustment

The reroute is necessary due to construction work on Cottage Grove between 107th and 111th streets, according to the transit agency. Officials said the work requires northbound buses to temporarily use an alternate path through the neighborhood. Southbound service on both routes will continue operating normally without changes. The CTA typically implements detours when street construction blocks regular bus paths, with routes returning to normal once work is completed.

Detour Affects Northbound Service Only

Northbound buses on routes #4 and #115 will be detoured via King Drive and 107th Street before resuming their normal route on Cottage Grove, officials said. The detour affects the section of Cottage Grove where construction is underway. Passengers traveling southbound won't see any service changes, with buses continuing on their regular paths. Officials advised riders using the affected northbound routes to allow extra travel time during the detour period.

Service Change Begins Tuesday Morning

The reroute is scheduled to begin Tuesday, April 7, 2026, at 6:00 AM, according to the CTA. Officials haven't determined an end date for the temporary detour, which will remain in effect until construction work is completed. The agency said it'll provide updates as the project progresses, though a specific timeline for when the routes will return to normal wasn't available.

Riders Advised to Plan Ahead

Passengers using routes #4 and #115 should expect slightly longer travel times on northbound trips during the construction period. The CTA advised riders to allow extra time when planning trips on the affected routes. Officials said southbound service will maintain regular schedules. Moovit provides real-time updates for CTA routes, helping riders track buses and plan trips during service changes.