While I don't do much traveling on European roads myself, I know a lot of people who have to do it daily and just like everywhere else in the World, traffic is always an issue. Luckily for them, Google Maps has now added 13 European countries to Google Maps from which they can now obtain live traffic info and hopefully avoid traffic jams:
Today we’re announcing new coverage in Austria, Belgium, Czech Republic, Denmark, Germany, Ireland, Israel, Luxembourg, Netherlands, Poland, Slovakia, Spain and Switzerland. Coverage includes all freeways and highways, as well as large roads in major cities. Users in the UK will also benefit from a finer grain of street level coverage.
Live traffic information gets updated every 5-10 minutes and is then piped down to Google Maps users. Changing the view allows you to even break traffic down by specific times and days of the week.
Source: Google LatLong