Hello, We would like to identify dangerous tight curves in our road database. To start I calculated a field called 'Sinuosity' with the following expression: "!Shape.Length! / (math.sqrt(math.pow((float( !Shape.FirstPoint.X!) - float( !Shape.LastPoint.X!)), 2) + math.pow((float( !Shape.FirstPoint.Y!) - float( !Shape.LastPoint.Y!)), 2)))"… Show more

It is common in river research to define sinuosity as a ratio of channel length over straight line distance. See here : sinuosity But in terms of roads, I agree with Joe Borgione Rather look for better evidence of what constitutes "dangerous".