1984

From the text:

In general you could not assume that you were much safer in the country than in London. There were no telescreens, of course, but there was always the danger of concealed microphones by which your voice might be picked up and recognized; besides, it was not easy to make a journey by yourself without attracting attention. For distances of less than 100 kilometres it was not necessary to get your passport endorsed, but sometimes there were patrols hanging about the railway stations, who examined the papers of any Party member they found there and asked awkward questions.