The cost of COASTER tickets is based upon the number of zones traveled (see map). Fare collection is based on a proof-of-payment system: tickets must be purchased before boarding and are checked by roving fare inspectors. Monthly passes are available. All tickets and passes include transfer agreements with NCTD BREEZE buses and monthly passes include transfer with the Metropolitan Transit System (MTS) buses and Trolleys. On January 20, 2011, the NCTD implemented a fare reduction – the fare reduction led to increased ridership on the COASTER and so was made a permanent fare reduction in September 2011. , regular one-way fares are as follows: