However, there are concerns that people who have long been accustomed to driving might stick to their old habits. In particular, pull factors alone are often not enough because the door-to-door convenience that only private vehicles can offer may be too attractive unless the disadvantages of driving are felt more acutely. Another factor of complexity stems from the fact that Suwon is part of the functional urban area of Seoul (according to the OECD methodology), which requires collaboration across administrative boundaries.