The 'California cyclometer' test measures which road property?
Choose the correct answer
Bitumen penetration in laboratory
'California cyclometer' is not a standard road test — British Pendulum Tester (BPN/SCRIM) measures skid resistance in India
Aggregate crushing value of stones
Road roughness using a profilometer
Correct Answer
B. 'California cyclometer' is not a standard road test — British Pendulum Tester (BPN/SCRIM) measures skid resistance in India
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Skid resistance testing: British Pendulum Tester (BPT, IS 9284) measures BPN (British Pendulum Number) — friction coefficient of pavement surface. Other tests: SFC (Sideways Force Coefficient) from SCRIM, DFT (Dynamic Friction Tester). NOT 'California cyclometer' (this is not a standard skid test — question is a trap). Correct: IRC:113 covers skid resistance; μ > 0.35 required on high-speed roads.
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