Some cars with very powerful engines can reach speeds of well over . Major German car manufacturers, except Porsche, follow a "gentlemen's agreement" by electronically limiting the top speeds of their cars—with the exception of some top of the range models or engines—to . These limiters can be deactivated, so speeds up to might arise on the German autobahn, but due to other traffic, such speeds are generally not attainable except during certain times like between 10 p.m. and 6 a.m. or on Sundays (when truck drivers have to rest by law). Furthermore, there are certain autobahn sections which are known for having light traffic, making such speeds attainable during most days (especially some of those located in Eastern Germany). Most unlimited sections of the autobahn are located outside densely populated areas.