Sources:

•  House Research Organization Focus Report, "State Boosts Tolls to Finance Highways," 12 November 2004.

•  House Research Organization, Proposition 12 Summary (2007)

•  HRO, Prop 14 Summary (2003)

•  HRO HB2702 Enrolled Bill Summary (2005)

•  HRO Bill Analysis HB2702 (5/11/2005)

•  HRO Bill Analysis SB792 (5/17/2007)