werenfried f.m. spit - (velocitat limitada per a la qualitat de l’aire, la situació actual als...
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2010/06/18
Speed Limits for Air QualityDutch update
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Zone 80
80: maximum capacityminimum emissions
2002: A13
effective
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National Air Quality Programma
• European and national measures• 4 present zones 80• 5 new zones 80• 20 km noise screens
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… but not always
A12 (The Hague):
complications
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Variable limit
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0
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1:00
2:00
3:00
4:00
5:00
6:00
7:00
8:00
9:00
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0
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0:00
inte
nsite
it (v
tg/u
ur)
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rijtij
d (m
inut
en)
IntensiteitRijtijd
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Variable limit
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Dynamax
• ‘Fast when possible, slow when needed’
• Adjust limits to– traffic intensity – weather– air quality
• Understandable • Acceptable
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Dynamax
high concentracion PM10 limit 80
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Conclusions
• speed limits are effective• details matter:
– road design– communication– enforcement
• dynamization is more balanced
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Questions?
Speed limits for air quality10 2010/06/18