Standing by the doors and not letting others on or off. Leaving food wrappers on the seat and floor. Playing music so loud you can hear it from 20 feet away.

In an effort to promote more courteous behavior among CTA customers, the agency — using feedback from customers — is launching an informational campaign designed to prompt consideration and discussion of the best ways to be courteous and considerate to fellow riders.

The campaign [Photo Gallery of artwork], featuring a series of messages to be placed on buses and trains, reflects some of the most commonly heard complaints from riders about the behaviors of fellow public transit passengers — not only on the CTA, but on transit systems throughout the world.

“The overwhelming majority of CTA customers are considerate of their fellow passengers,” said Graham Garfield, GM, Customer Information. “However, based on feedback we’ve received from passengers, we believe this public-service campaign will help improve the transit experience by continuing the dialogue about courtesy among our customers. We hope it will encourage customers to think more about courteous behavior on CTA trains and buses.”

The courtesy campaign messages cover a wide range of discourteous passenger behaviors, from littering and eating on trains to not using all available doors on an arriving train. Garfield noted that while many of the behaviors have an obvious impact customer experience — for example, eating can create a mess on seats and floors, as well as unwanted odors — some have impacts that are less obvious, but no less important. For example, customers who crowd around one set of train doors while boarding instead of moving down the platform to other doors can cause delays in service. And a discarded newspaper can not only create a mess inside a bus or rail car, if can cause a minor fire at track level.

CTA used feedback from social media, calls/emails to CTA Customer Service, and observations of CTA personnel to develop the courtesy campaign subject matters. The messages will begin appearing on buses and trains this week.

The campaign, developed in-house by CTA staff, is the latest effort by the CTA to improve customer communications and passenger comfort. Among other efforts since 2011, the CTA has expanded digital information screens with bus and train service info, launched a rail-safety reminder campaign, and created the Renew Crew program to bring long-overdue improvements to 100 rail stations.

Transit agencies across the country and throughout the world have launched courtesy campaigns, targeting many of the same behaviors as the CTA campaign. CTA last used a courtesy campaign in the early 2000s.

The CTA is the nation’s second-largest transit agency, providing about 1.6 million rides on an average weekday. Each weekday, CTA provides more than 2,200 train trips and more than 19,000 bus trips.

More information about the campaign is available at www.transitchicago.com/courtesy