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sci.traffic-noise-CRTN Calculator
Calculates traffic noise level using the UK Calculation of Road Traffic Noise (CRTN) method from traffic flow, speed, gradient, and surface type. CRTN noise level scales as 10 log₁₀(Q) + 33 log₁₀(v) + correction terms — lorries (trucks) contribute +10 dB per vehicle vs cars due to tyre and engine noise.
Inputs
Q Vehicles Per Hr
Reference formula or conversion factor shown for context.
V Km H
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
D M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Hgv Pct
Age in completed years. Many health and fitness formulas adjust for age.
Results
L₁₀(18hr) (dBA)
Reference formula or conversion factor shown for context.
Leq estimate (dBA)
The value at the specified point or condition.
L_night estimate (dBA)
The value at the specified point or condition.
UK planning threshold
Sample size or count used in the calculation.
CRTN formula basis
The specific form or variant of the result.
WHO Road Traffic Noise Guideline
Random or irrelevant variation in the measurement.