While the guideline focused on solving the traffic issues due to the overpopulation of the downtown area, it set the consequent goals of improving the city with more efficiency resulting from shorter commuting times, cleaner environment with reduced auto traffic and energy expense, larger outreach to bring the transit to those outside the urban area, and improved transportation capacity.After the second 24.9 km (15.5 mi) long section of Line 1 between Jincheon and Ansim opened on May 2, 1998, the extension was made to Daegok towards south in May 2002.The most recent extension was made in December 2024 from Ansim to Hayang, making Line 1 37.1 km (23.1 mi) long with 35 stations.Another construction to add the 3.3 km (2.1 mi) long section to the line from Sawol to Yeungnam University of Gyeongsan was completed in September 2012.[6] The incident raised great concerns and consequent awareness in the public safety of the metro transit, prompting the city to replace the subway car's internal materials to be more flame retardant, placing the emergency gas masks and respirators within the subway cars, and improving the safety guidelines.