Summary of the effects of no daytime speed limits:
1. Fatal accident rates on these highways reached an all time low in modern times.
2. On 2 lane highways with no posted limits the frequency of multiple vehicle accidents dropped 5 percent.
3. Seat belt usage is up to 91% percent, with only a secondary enforcement law.
4. Posted limits and their enforcement, had either no or a negative effect on traffic safety.
5. As predicted by the engineering models, traffic speeds did not significantly change and remained consistent with other western states with like conditions.
6. The people of Montana and its visitors continued to drive at speeds they were comfortable with, which were often speeds lower than their counter parts on high density urban freeways* with low posted limits.
7. The theory behind posting speed limits on these classifications of highway is to reduce conflicts in traffic flow (caused by speed differential), thereby reducing accidents. On the two lane highways flow conflict accidents (multiple vehicle) decreased when the limits were removed. When added to the Autobahn results and the no change found on Montana’s Interstates, this thesis needs to be rethought because the field data on highways without posted limits doesn’t support it. With the expectation of higher speed differentials, multiple vehicle accident rates declined even when the actual speeds did not change significantly. This suggests the changes are the result of positive motorists behavior (courtesy and due caution).
8. In
traffic engineering findings the vehicles traveling faster than average have the lowest accident rates, yet they are the primary targets of speed enforcement. To this we can now add, with speed limits there was no positive correlation between speed enforcement and accident rates on rural free flowing highways, if anything, the highways became less safe.
MONTANA PARADOX: Is that the desired safety effect from posting speed limits was achieved by removing them.
Followup Footnote: At the end of 2001, a year after Montana implemented its new NHTSA backed and sponsored enforcement program, fatalities increased significantly. Now another year of data is in (2002), Montana just recorded a 20 year high in fatal accidents.
We have two choices, we can follow those policies that result in a net reduction in fatalities, or those that have been documented for over 70 years to actually increase fatalities. After decades of NHTSA propagated myths, we as a nation have chosen the later.
Supporting an industry, according to the FHWA, that issues over 90 percent of its speed citations for "speed limits which are set artificially low... misallocate resources, apprehending and prosecuting motorists driving at safe speeds".