Found some useful information:
I. Know Thy Enemy
Traffic obstruction advocates are local residents, usually few in number, who have decided to rid their street of unwanted traffic. They may use a collection of politically correct excuses, usually espousing a safety concern or the politically correct "it's for the children" argument. However, their overriding concern is most often "heavy traffic." Because they are local residents, they can attend public meetings and harangue elected officials, unlike motorists who simply pass through a community. The debate is usually one sided and the local officials eventually cave in to the demands for traffic obstruction installations. From their perspective, it's the easiest thing to do.
V. Arguments Against Traffic Obstruction Devices
Traffic obstruction devices:
A. Can increase response time for emergency vehicles. When seconds matter, having to slow to pass over speed bumps and humps or navigate narrow roadways can mean the difference between life and death, or the loss of one's home. The fact that some of these devices can seriously damage emergency vehicles and other vehicles along the roadway is also a concern.
B. Can increase congestion on other streets and create problems in other neighborhoods. If traffic obstruction devices divert traffic to other streets, they may compound congestion problems that already exist in those areas. If not successful in diverting traffic to other streets, traffic obstruction devices will compound congestion problems on the streets on which they are installed.
C. Will increase vehicle wear and tear, air pollution, and noise. Braking and accelerating in response to speed bumps, speed humps, stop signs, and traffic signals increases fuel consumption and emissions. This can contradict other efforts to reduce emissions and contribute to a community becoming or remaining a "non-attainment" air quality zone, thereby being subjected to federal mandates and restrictions.
D. Can increase street maintenance costs. Speed bumps and humps impede plowing and street cleaning equipment. Removable devices may soon be available, although they will require additional labor to install and remove them. Municipalities must maintain and repair stop signs and traffic signals, at taxpayer expense, of course.
E. Increase a community's liability for accidents attributed to such devices.
F. May cause physical discomfort, even pain, for disabled persons or persons with physical ailments. Being jolted or jostled by speed bumps and humps can be painful for persons with injuries or painful illnesses.
G. Create neighborhood friction. Not all persons (not even most persons) on a given street will appreciate having to run an obstacle course every time they drive to or from home. Some traffic obstruction opponents blow their horns or yell verbal insults when having to slow or stop for speed bumps or humps. Frequently, the response to unnecessary stop signs is to ignore them.
Some more information:
http://www.motorists.org/traffic-calming/problems
very interesting:
Members of city councils and transportation divisions often portray delay to emergency response by calming devices as simply a tradeoff for increased safety from speeding cars. They avoid making the analysis which shows which risk is greater. Ronald Bowman, a scientist in Boulder, Colorado developed an analysis to compare these risks. The results show that even minor delay to emergency response by calming devices imposes far greater risk on the community than vehicles, speeding or not. The result of Bowman's analysis, showed a risk factor of 85 - 1 from an additional one minute of delay (predicted to result from the installation of all the devices proposed for the City of Boulder at the time) before one life might be saved by the devices -- if it can be shown that the devices do save lives. Bowman's analysis, based on the curve of survivability for victims of cardiac arrest and severe trauma (AHA) has been verified by a professional mathematician.
Maybe we should look in the minutes to see what discussion took place about the bumps. I am sure ALL the negative consequences were discussed, including the possible life harming implications. /S