Traffic noise formula (Traffic Noise Overlay) - Revision history

Frank@tygron.nl at 09:40, 15 July 2026

2026-07-15T09:40:19Z

← Older revision		Revision as of 09:40, 15 July 2026
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	The calculations for the [[Traffic Noise Overlay]] follow the standard ~~rekenmethode~~ 1 (SRM 1){{ref\|srm1}}.		The calculations for the [[Traffic Noise Overlay]] follow the standard Calculation Method 1 (SRM 1){{ref\|srm1}}.

	<math>LAeq = E + C_o + C_r - D_a - D_l - D_b - D_m</math>		<math>LAeq = E + C_o + C_r - D_a - D_l - D_b - D_m</math>

Frank@tygron.nl: /* Distance reduction */

2026-07-15T09:39:44Z

Distance reduction

← Older revision		Revision as of 09:39, 15 July 2026
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	Distance reduction is computed as:		Distance reduction is computed as:

	<math>D_a = 10 \cdot ~~log~~(r)</math>		<math>D_a = 10 \cdot log_{10}(r)</math>

	where:		where:

Frank@tygron.nl at 12:53, 8 July 2026

2026-07-08T12:53:13Z

← Older revision		Revision as of 12:53, 8 July 2026
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	{{article end		{{article end
	\|notes=		\|notes=
	* If ~~the~~ traffic amount is ~~defined as~~ a single value, ~~that value is used for~~ all defined [[Hours (Traffic Density Overlay)\|hours]]. ~~However, if the amount~~ is an [[Attribute array\|array of values]], each ~~of the 24 indexes of that array are assumed to correspond~~ to ~~the~~ hour ~~denoted by those indexes, and as such that specific value from the array is used~~.		* If traffic amount is a single value, it applies to all defined [[Hours (Traffic Density Overlay)\|hours]]. If it is an [[Attribute array\|array of values]], each index corresponds to its respective hour.
	\|seealso=		\|seealso=
	* [[Traffic Noise Overlay]]		* [[Traffic Noise Overlay]]

Frank@tygron.nl at 11:10, 8 July 2026

2026-07-08T11:10:59Z

← Older revision		Revision as of 11:10, 8 July 2026
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	<math>C_o = 1.4 + \frac{Q_v + Q_t + Q_b}{ Q_c + Q_v + Q_t + Q_b}</math>		<math>C_o = 1.4 + \frac{Q_v + Q_t + Q_b}{ Q_c + Q_v + Q_t + Q_b}</math>

			where:
			: <math>Q_c</math> = number of cars per hour
			: <math>Q_v</math> = number of vans per hour
			: <math>Q_t</math> = number of trucks per hour
			: <math>Q_b</math> = number of buses per hour

	===Distance reduction===		===Distance reduction===
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	:<math>E_{c,start}</math> Emission start value. Configurable with model attribute [[Emission start (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]		:<math>E_{c,start}</math> Emission start value. Configurable with model attribute [[Emission start (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
	:<math>E_{c,mult}</math> Emission factor. Configurable with model attribute [[Emission mult (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]		:<math>E_{c,mult}</math> Emission factor. Configurable with model attribute [[Emission mult (Traffic Noise Overlay)]]. See also: InfoMil [https://www.infomil.nl/onderwerpen/geluid/regelgeving/wet-geluidhinder/wegverkeerslawaai/akoestisch-rapport/cwegdek/]
	:<math>V_c</math> = The traffic type's speed, configured in roads with ~~Function Value~~ [[Traffic speed (Traffic Noise Overlay)\|TRAFFIC_SPEED]].		:<math>V_c</math> = The traffic type's speed, configured in roads with attribute [[Traffic speed (Traffic Noise Overlay)\|TRAFFIC_SPEED]].
	:<math>V0_c</math> = The traffic type's reference speed, configured per traffic type using the model attribute [[V0 (Traffic Noise Overlay)\|V0]].		:<math>V0_c</math> = The traffic type's reference speed, configured per traffic type using the model attribute [[V0 (Traffic Noise Overlay)\|V0]].
	:<math>\sigma</math> = road surface correction value at reference traffic speed. Configurable in roads with ~~Function Value~~ [[Traffic noise sigma (Traffic Noise Overlay)\|TRAFFIC_NOISE_SIGMA]]		:<math>Q_c</math> = number of cars per hour, configured with Function Value [[Cars per hour (Function Value)]]
	:<math>\tau</math> = road surface correction factor per 10 km/hour deviation from reference traffic speed. Configurable in roads with ~~Function Value~~ [[Traffic noise tau (Traffic Noise Overlay)\|TRAFFIC_NOISE_TAU]]		:<math>\sigma</math> = road surface correction value at reference traffic speed. Configurable in roads with attribute [[Traffic noise sigma (Traffic Noise Overlay)\|TRAFFIC_NOISE_SIGMA]]
			:<math>\tau</math> = road surface correction factor per 10 km/hour deviation from reference traffic speed. Configurable in roads with attribute [[Traffic noise tau (Traffic Noise Overlay)\|TRAFFIC_NOISE_TAU]]

	{{article end		{{article end

Frank@tygron.nl at 13:33, 6 July 2026

2026-07-06T13:33:19Z

← Older revision		Revision as of 13:33, 6 July 2026
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	{{article end		{{article end
	\|notes=		\|notes=
	* If the traffic amount is defined as a single value, that value is used for all defined [[Hours (Traffic Density Overlay)\|hours]]. However, if the amount if an [[Attribute array\|array of values]], each of the 24 indexes of that array are assumed to correspond to the hour denoted by those indexes, and as such that specific value from the array is used.		* If the traffic amount is defined as a single value, that value is used for all defined [[Hours (Traffic Density Overlay)\|hours]]. However, if the amount is an [[Attribute array\|array of values]], each of the 24 indexes of that array are assumed to correspond to the hour denoted by those indexes, and as such that specific value from the array is used.
	\|seealso=		\|seealso=
	* [[Traffic Noise Overlay]]		* [[Traffic Noise Overlay]]

Frank@tygron.nl: /* Distance reduction */

2026-07-06T13:33:00Z

Distance reduction

← Older revision		Revision as of 13:33, 6 July 2026
Line 38:		Line 38:
	: <math>r</math> = shortest distance between the source and point of evaluation		: <math>r</math> = shortest distance between the source and point of evaluation

	[[File:Geluidsoverlast.png\|600px\|Traffic Noise]]		[[File:Geluidsoverlast.png\|600px\|Traffic Noise.]]

	===Emission===		===Emission===

Frank@tygron.nl: /* Distance reduction */

2026-07-06T13:32:49Z

Distance reduction

← Older revision		Revision as of 13:32, 6 July 2026
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	: <math>r</math> = shortest distance between the source and point of evaluation		: <math>r</math> = shortest distance between the source and point of evaluation

	[[File:Geluidsoverlast.png\|600px\|Traffic Noise ]]		[[File:Geluidsoverlast.png\|600px\|Traffic Noise]]

	===Emission===		===Emission===
	Emission is computed as:		Emission is computed as:

Frank@tygron.nl at 13:32, 6 July 2026

2026-07-06T13:32:35Z

← Older revision		Revision as of 13:32, 6 July 2026
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	===Acceleration term on intersections===		===Acceleration term on intersections===
	Accelerating on intersections can cause more noise. This value is only calculated for roads of category INTERSECTION. It is calculated as ~~followed~~:		Accelerating on intersections can cause more noise. This value is only calculated for roads of category INTERSECTION. It is calculated as follows:

	<math>C_o = 1.4 + \frac{Q_v + Q_t + Q_b}{ Q_c + Q_v + Q_t + Q_b}</math>		<math>C_o = 1.4 + \frac{Q_v + Q_t + Q_b}{ Q_c + Q_v + Q_t + Q_b}</math>
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	: <math>r</math> = shortest distance between the source and point of evaluation		: <math>r</math> = shortest distance between the source and point of evaluation

	[[File:Geluidsoverlast.png\|600px]]		[[File:Geluidsoverlast.png\|600px\|Traffic Noise ]]
	===Emission===		===Emission===
	Emission is computed as:		Emission is computed as:
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	:<math>Eb</math> = the calculated noise emission for buses		:<math>Eb</math> = the calculated noise emission for buses

	The emission per type of traffic is computed similarly, with values specific to the type of traffic. It is calculated as ~~followed~~ for car traffic:		The emission per type of traffic is computed similarly, with values specific to the type of traffic. It is calculated as follows for car traffic:

	<math>Ec = E_{c,start} + E_{c,mult} \cdot log_{10}( \frac {V_c}{V0_c} ) + 10 \cdot log_{10}( \frac{Q_c}{V_c} ) + \sigma + \tau \cdot log_{10}( \frac{V_c}{V0_c} )</math>		<math>Ec = E_{c,start} + E_{c,mult} \cdot log_{10}( \frac {V_c}{V0_c} ) + 10 \cdot log_{10}( \frac{Q_c}{V_c} ) + \sigma + \tau \cdot log_{10}( \frac{V_c}{V0_c} )</math>

Frank@tygron.nl: /* Emission */

2026-07-06T13:31:37Z

Emission

← Older revision		Revision as of 13:31, 6 July 2026
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	The emission per type of traffic is computed similarly, with values specific to the type of traffic. It is calculated as followed for car traffic:		The emission per type of traffic is computed similarly, with values specific to the type of traffic. It is calculated as followed for car traffic:

	<math>Ec = E_{c,start} + E_{c,mult} \cdot log_{10}(\frac {V_c}{V0_c}) + 10 \cdot log_{10}(\frac{Q_c}{V_c}) + \sigma + \tau \cdot log_{10}(\frac{V_c}{V0_c})</math>		<math>Ec = E_{c,start} + E_{c,mult} \cdot log_{10}( \frac {V_c}{V0_c} ) + 10 \cdot log_{10}( \frac{Q_c}{V_c} ) + \sigma + \tau \cdot log_{10}( \frac{V_c}{V0_c} )</math>

	where:		where:

Frank@tygron.nl: /* Emission */

2026-07-06T13:31:09Z

Emission

← Older revision		Revision as of 13:31, 6 July 2026
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	Emission is computed as:		Emission is computed as:

	<math>E = 10 \cdot log_{10}(10^{\frac{Ec}{10}} + 10^{\frac{Ev}{10}} + 10^{\frac{Et}{10}} + 10^{\frac{Eb}{10}})</math>		<math>E = 10 \cdot log_{10}(10^{ \frac{Ec}{10} } + 10^{ \frac{Ev}{10} } + 10^{ \frac{Et}{10} } + 10^{ \frac{Eb}{10} })</math>

	where:		where: