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Q: Which instrument is used for the measurement of the longitudinal coefficient of friction?
  • A. Bump integrator
  • B. Both bump integrator and roughometer
  • C. Roughometer
  • D. Speedometer
Correct Answer: Option B - For the measurement of longitudinal coefficient of friction following instruments are used– (i) Roughometer– • Roughometer is a high speed device used for measuring pavement surface roughness. • The output is in the units of international roughness index (IRI) Bump integrator– • It is an automatic road unevenness recorder, an indigenous device developed by (RRI). (ii) Response type road roughness meters (RTRRM) (iii) Profiling devices.
B. For the measurement of longitudinal coefficient of friction following instruments are used– (i) Roughometer– • Roughometer is a high speed device used for measuring pavement surface roughness. • The output is in the units of international roughness index (IRI) Bump integrator– • It is an automatic road unevenness recorder, an indigenous device developed by (RRI). (ii) Response type road roughness meters (RTRRM) (iii) Profiling devices.

Explanations:

For the measurement of longitudinal coefficient of friction following instruments are used– (i) Roughometer– • Roughometer is a high speed device used for measuring pavement surface roughness. • The output is in the units of international roughness index (IRI) Bump integrator– • It is an automatic road unevenness recorder, an indigenous device developed by (RRI). (ii) Response type road roughness meters (RTRRM) (iii) Profiling devices.