In New York, markers appear every tenth of a mile along state roads and track accident history and road work, explains the New York State Department of Transportation. Mile markers along local, state and interstate highways allow motorists to describe their exact location, notes the National Center for Families Learning.
A highway reference marker in New York contains letters and numbers that designate the route number, department of transportation region number, county number within the region, order number and segment number, according to the New York State Department of Transportation. A final number denotes the mileage from specific points.
Mile markers along highways help emergency crews reach accidents or broken-down vehicles more quickly, states the National Center for Families Learning. Mile markers coordinate with exit numbers, and these signs help determine how far away a driver is from a state border.