Under the Road Traffic Act and its subordinate statutes, which violation in a senior protection zone between 8 a.m. and 8 p.m. does NOT carry an increased fine?

Answer: ④ Crossing the center line

In children's and senior protection zones, fines are increased during the day for violations that directly endanger pedestrians, such as running signals, illegal stopping or parking, speeding, and obstructing pedestrians at crosswalks. Crossing the center line is not on that list of aggravated violations. [Enforcement Decree of the Road Traffic Act, Annex 10]