Sentence:  Anyone found travelling without a valid ticket will be issued with a <WSD>standard fare</WSD> of £100 which must be paid within 21 days. This charge will be reduced to £50 if paid within 14 days. 
Meaning of the word marked with <WSD> tags:  The price charged to passengers who travel without buying tickets in advance on certain public transport systems (especially British bus and tram systems) ("compare" penalty fare).