Lower Saxony, especially Hannover, has an excellent public transport system that is clean, efficient and safe:
http://www.uestra.de(in German only)

Clausthal-Zellerfeld is small enough to get around on foot or by bike (you may rent one upon arrival). If you prefer public transport, there is always the “Buergerbus” to take you around town:
http://www.region.tu-clausthal.de/bbus/ (in German only)

Transportation to other towns and cities is via bus to Goslar:
http://www.rbb-bus.de/index.php?id=61 (in German only)

For all public transport in Hannover, Clausthal-Zellerfeld and other German cities one can buy single tickets, a book of tickets, or a weekly or monthly pass. A student discount is available. Tickets must be purchased before getting on or from the driver. If you fail to have a ticket upon inspection, you will be charged 40 €.

The Deutsche Bahn AG probably provides the best way of getting around in Germany, since its networks connect even the most remote villages with larger towns and big cities:
http://www.bahn.de/international/view/en/index.shtml

The Deutsche Bahn service is one of Europe’s best, but also one of the most expensive. Punctuality and good connections are the specialties of the German system. If you want to reach far-away towns by train, your quickest option is the ICE – InterCityExpress. However, the ICE is also the most expensive train in Germany; the higher price is often only worth it, if you travel a really long distance. You can get cheaper tariffs if you book the ICE ticket early (early bird rates) or buy a “Surf & Rail Ticket” on the Internet.

On middle-distance routes, you will often be well served by a less expensive IC (InterCity) train. People who travel a lot by rail should certainly buy the rail card called Bahncard, which gives your price reductions of up to 50%.
You may obtain tickets online via credit card, at any train station or travel agency. At any rate, you need to have purchased your ticket prior to boarding a train. Otherwise you will be charged a penalty up to 60 €.
If you plan to travel within or beyond Germany outside your internship period, buy a Eurail Pass in your home country:
www.eurail.com

This way of traveling is very popular with German students. The “Mitfahrzentrale” is a safe and cheaper option to travel between cities. Somebody, who will go by car – let’s say from Hannover to the capital Berlin – signs up at this internet platform. There he provides all the necessary information about date, time of departure, route, contact details, etc. Now, you can check the platform and you can contact the driver, if you would like to join the ride. You will negotiate the fare beforehand. Some drivers take up to 3 passengers per ride.
www.mitfahren.de

If you would like to drive a car in Germany, you must hold a driver’s license. The license also specifies what kinds of vehicles you are allowed to drive (car, truck, motorbike). You must carry your driving license and vehicle registration document with you every time you take a drive – and must present these documents in case of a police check.
Be sure you familiarize yourself with traffic rules and road safety issues in Germany and other countries to which you may be traveling.

Most car-hire companies only rent vehicles to customers who are older than 21. They do this to reduce the risk of accident since the worst traffic accidents are often caused by novice drivers. Besides the age-limit, the conditions set by car hire companies differ greatly. It will be worth comparing prices in advance. As a rule, you can save a lot of money by doing so. And before you sign the contract, please make sure that you read the small print carefully, for example on liability in the event of an accident or on what happens if you exceed the hire term. Otherwise the adventure can become very expensive. A list of the most common car hire companies can be found at
http://de.dir.yahoo.com/Firmen/Kraftfahrzeuge/Autovermietungen/

You may also use the car sharing system at Clausthal University of Technology: You will have to pay a deposit of 200 €, a one-time fee of 10 € and off you go.
http://www.mobil.tu-clausthal.de/carsharing/ (in German only)

So-called cheap airlines enable you to buy inexpensive tickets for domestic, European and international flights – whereby the really cheap tickets can generally only be obtained by booking very early. You may find an up-to-date list of cheap airlines on the following website:
www.billigflieger.de (in German only)

The most common low-fare airlines are Germanwings, Airberlin, EasyJet, and Ryanair:
http://www.germanwings.com/index.en.shtml
http://www.airberlin.com
http://www.easyjet.com
http://www.ryanair.com