Stop Chicken Little: The Truth about Traffic Calming in Portland, Maine |
|
Stevens Avenue Project : French Auto Club ReportThe following is a International Automobile Federation (France) report on a study done by the Austrians. It measured actual tailpipe emissions, not just a computer model of what might happen.
Alliance Internationale de Tourisme (33) 1.42.65.99.51 Federation Internationale de l’Automobile (33) 1.49.24.98.00 Place de la Concorde PARIS, France AIT/FIA TRAFFIC COMMISSION Meeting of 6th September 1994 in Munich Item 4.4. Power and Speed of Vehicles Rapporteur: Mr. Jean-Martin Kuntschen (TCS) SPEED
BUMPS CAUSE TEN TIMES MORE AIR POLLUTION An impact study on the environment carried out in Austria and based on normal driver behaviour demonstrated that speed bumps had negative effects on both the environment and fuel consumption. A regular traffic flow would therefore always be more environment-friendly. A TCS mobile exhaust fume measuring device (MAMA) was used to carry out the tests. The equipment consisted of a high precision measuring device placed in a medium-range vehicle in which the catalytic converter had been tuned in advance. Before the test took place, all the measuring devices were inspected and calibrated by the Combustion Engines Institute of the Technical University of Vienna Test with six speed bumps The test took place on a 1.5 km stretch of road containing six speed bumps. Speed was limited to 30 km/h. The test took place in two phases, In the first phase, the vehicle slowed down to 15 km/h before the bumps and accelerated to 30 km/h after the bumps-as is the practice of many drivers. In the second phase the vehicle came to a halt before each bump.
Staggering
results The results of the tests were as follows: a vehicle which slows down to 15 km/h before the bump and accelerates to 30 km/h immediately after the bump emits 10 times as much nitrogen oxide (NOx) as a vehicle which maintains a constant speed of 30 km/h. NOx emission per kilometre thus increases from 0.03 gm to 0.3 gm. The vehicle which drew to a halt at each bump showed a NOx emission of 0.24 gm/km, i.e. 8 times more than that of a vehicle maintaining a constant speed of 30 km/h. On the stretch of road containing speed bumps carbon monoxide (CO) emissions were three times as great as those of a vehicle maintaining a constant speed. Fuel consumption increased from 7.9 litres to an additional two litres (9.9) per lOO km on the stretch of road where the vehicle braked six times. Carbon dioxide emission (CO2) increased in the same way. Hydrocarbon (HC) emissions were so low in all cases that they were below the probative level. |