Per NMDOT 2019 618.2.4, alternate traffic-signal timing plans are required for long-term temporary traffic control lasting longer than how many calendar days, and who shall stamp the work?

1. Only permanent signals after final acceptance, with no PE required
2. Longer than five calendar days, developed and stamped by a licensed Professional Engineer in New Mexico
3. Longer than 90 calendar days, stamped by the TCS
4. Any closure over two hours, stamped by a flagger