How is superelevation measured?

Superelevation is measured using a cross level tool. This tool helps in determining the slope of the roadway, which is vital for proper drainage and vehicle safety. Superelevation refers to the banking of a roadway at a curve, which counteracts the lateral acceleration experienced by vehicles, allowing for safer and more efficient travel around corners.

A cross level tool provides precise measurements of the elevation difference across the width of the roadway, thus allowing engineers to compute the superelevation angle accurately. This measurement is essential for designing roads that accommodate vehicle dynamics and ensure stability, especially at higher speeds.

The other methods mentioned do not provide a reliable or precise way to measure superelevation. A speedometer measures vehicle speed, visual inspection relies on subjective judgement, and weight measurement is not relevant to the angle or slope of the roadway.