Reference marker

Type of highway sign in New York, US A representation of a reference marker found on NY 940U In New York, a reference marker is a small green sign mounted approximately every one-tenth mile on highways maintained by the New York State Department of Transportation. This was initiated in response to the Highway Safety Act of 1966[failed verification] enacted by Congress, in an effort to monitor traffic and identify high-accident locations. New York's system inventories and indexes all touring and reference routes, in addition to service and rest areas, ramps, and reservation roads. New York's system is similar to California's postmile system in maintaining the state's highways and route logs. The New York State Thruway Authority adopted its own reference system for the New York State Thruway system, including I-287. There is a similar reference marker system in use in neighboring Vermont. Description A reference marker on NY 17 (the small square sign in the lower left corner of the photo). The reference markers (popularly referred to as "little green signs", or "tenth-mile markers") are typically-green signs that measure 8 inches (200 mm) wide by 10 inches (252 mm) high and are place