Unfortunately it is common in a lot of roads in Colorado. The gubmint is spending money in social programs and are out of money; they are now considering a statewide tax, but it needs to go before the voters in order to enact any tax. Taxpayer Bill of Rights (TABOR) prevents legislators from taxing at will. Early indicators are that it will not be approved by the voters.
...it is a major point of contention and the topic of many local talk radio hosts.