Hitchhiking in the Netherlands is quite easy and legal in most places (but not on motorways). A basic rule of thumb is that when you are allowed to walk somewhere, you can also stand there for hitchhiking. Sometimes it’s easier to ask people in a service station for a lift rather than waiting by the side of the road pointing with your thumb. Remember that some people might be offended and some service stations may not like strangers approaching their customers. Hitchhiking is done at your own personal risk. A useful resource for hitchhikers is hitchwiki where you can search for the Netherlands or Maastricht to find more specific advice.