Originally Posted by miserablewithAC

Some more observations:

Very few exits have advance signs indicating that they are ahead a few kilometres - usually only the kreutz (where two Autobahns cross), or major airports have signs which indicate the approaching exit. Instead it is more common to post large overhead signs with the mileage (in kms) to the next three city/exits. Exits are numbered but not indicated on the mileage signs - usually only numbered right at the exit itself. Read your map ahead of time.