Traffic jams are wreaking havoc on European motorways as holiday makers head off to enjoy their summer holidays. The German Algemeiner Deutscher Automobil-Club (ADAC) expects this weekend produce some of the worst traffic jams of the year across the country. The queues will be particularly noticeable on roads in Bavaria as tourists head to popular holiday destinations of Italy and Austria, according to the ADAC. The first major wave of travellers set out on Friday, but many families will also be making their way south on Saturday and Sunday, says ADAC traffic expert Alexander Kreip. 14 kilomet…