What is a significant success of ADFC Köln in improving cycling safety, and how did they achieve it? Additionally, list three ways a private citizen can support or get involved with ADFC Köln's efforts to promote cycling in Cologne.
Navigate to 'koeln.adfc.de'. Click on 'Radverkehr' in the main navigation. Click on 'Radlobby' (or 'Lobbyarbeit') in the sub-navigation. Scroll down the page to find information on ADFC Köln's achievements. If more content is available, click 'Mehr Artikel laden' to reveal it. Identify a significant success related to cycling safety and how ADFC Köln contributed to it. Identify three distinct ways citizens can support or get involved with ADFC Köln. State the identified success, its accomplishment, and the three ways to get involved.
Identify the '1.5-meter overtaking distance' law ('1,5 Meter Abstand beim Überholen') as a significant success. State that the '1.5-meter overtaking distance' law was accomplished through 'Our campaign' ('Unsere Kampagne war erfolgreich!' or similar phrasing indicating ADFC Köln's direct involvement). List 'Mitglied werden' (become a member), 'Spenden' (donate), and 'Newsletter' (subscribe to newsletter) as three ways citizens can support or get involved.