The Frequent Network provides service every 10 minutes or less between 6 a.m. and 9 p.m. on weekdays and 9 a.m. to 9 p.m. on weekends. With the update, an estimated 70% of the CTA service area is now within half a mile of a frequent bus route.

The Federal Transit Administration on Friday said it determined the CTA failed to comply with a special directive issued earlier this month that required the agency to implement “immediate, measurable corrective actions” aimed at reducing violent crime and addressing “unsafe conditions.

The Federal Transit Administration threatened to pull federal funding for the Chicago Transit Authority over its newly launched security surge.

The new schedule will add four routes to the Frequent Network while improving midday, nighttime and weekend service.

Federal transit officials are ordering the CTA to submit a new, tougher safety plan within 90 days or risk losing a quarter of its federal operating funds, citing failures to meaningfully address crime on the system.

The frequent service network consists of 20 key bus routes throughout the agency’s service area that are scheduled to have service every 10 minutes or less from 6 a.m.-9 p.m. on weekdays and 9 a.m.-9 p.