AFAIK wrote:So that drivers don't know which trees have police and err on the side of caution by driving slowly all the time (at least in theory).
http://venturebeat.com/2012/10/17/hacke ... c-tickets/If departments wanted people to drive safely 24/7, then speed enforcement would be conducted on a regular basis and consistently enforced. However, the fact that state police departments
1) Have quotas
2) Enforce speed limits very loosely (ex : some officers may only ticket for 10 over or more, and PBA cards can get you off with a warning)
3) Enforce limits infrequently (source indicates more tickets are issued at the end of the month)
Means that the use of speed enforcement traps and low speed limits is primarily motivated by revenue, not safety. If safety is the first priority, speed limits would be enforced tightly and on a consistent basis. Those individuals that choose to drive at significantly higher speeds will simply negate the surprise advantage through the purchase of a radar detector. Thus, these traps mainly target the majority of motorists who drive safely, yet are technically breaking the law due to cash grabbing regulations.
AFAIK wrote:To keep stopping distances within a safe limit. Also low speed limits are sometimes enforced to maintain traffic flow. Slow and steady is preferable to stop and start conditions. Perhaps noise and air pollution are concerns as well.
Traffic flow due to differences in speed could be resolved if slower traffic were required to move to the right lanes, and faster traffic was directed to the left lanes. It isnt a law in most states, but it should be done out of courtesy (despite what prius drivers and octogenarians do). Also, stopping distances are less important than keeping a proper amount of space between the vehicle in front. The only instance in which stopping distances would be disparate enough to cause a collision is when the vehicle behind travels faster than the vehicle in front.
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