Figure 3.
Berlin 2018. Slow (resp. medium, fast) km in green (resp. blue, red). The 12–13 class is decomposed into two subclasses, 6 medium and 6 slow km.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.