DANBURY, CT TRAFFIC
This report provides an inventory and action
plan for the City of Danburys traffic flow and
safety improvement needs as of 2001. The goal of HVCEO in
preparing this specialized report for the municipality is
to concentrate and organize key information on traffic improvement
needs, for ease of use by all concerned.
This specialized research should also be referenced as permit
application conditions are set by planning and zoning commissions,
as an input to setting enforcement priorities by the police
department, for municipal traffic related grant applications
and by citizens shaping governmental decisions. Having this
research available also greatly reduces the cost of preparing
the transportation chapter for the municipal plan of conservation
Federal law requires that municipal traffic needs must appear
in this HVCEO document before any federal financial assistance
can be granted. Traffic improvement projects described herein
should be prioritized by community leaders and then brought
to HVCEO, Conn DOT and legislators for implementation.
This inventory has much information on state roadway traffic
safety, making use of Conn DOT accident rate data. This valuable
data in contained in the Conn DOT Traffic Accident Surveillance
Report, or TASR. In that report, each state roadway
is evaluated for indications of higher than statistically
expected accident rates. HVCEO uses TASR ratings approaching
90% or over as indicators of possible priority for remedial
The sites that stand out as safety problems appear on past
or present Conn DOT TASR lists. Conn DOT itself prioritizes
the TASR by designating its highest risk locations
as the "Suggested List of Surveillance Study Sites"
or SLOSSS. When there is a documented SLOSSS problem, public funds can more easily be attracted to resolve
Conn DOTs TASR traffic hazard rating procedure
first determines an actual accident rate for a location. A
"critical rate" is then computed and compared to
the actual rate. If the resulting ratio of actual to critical
(or expected) rates is 1.00 or above (written as 100% or above
herein), and as a further screening process the location has
had a minimum of 15 accidents in the three year period evaluated,
then the location is put in the priority subsection of the TASR known as the SLOSSS.
Generally referred to as the high hazard list"
Conn DOT cautions that SLOSSS statistics do not necessarily
prove by themselves that a location is high hazard. Rather,
the TASR and SLOSSS statistical systems are
tools to focus traffic investigations and investments.
In evaluating these data sets for the municipality, priority
concern should be given to sites with comparatively higher SLOSSS rates and with these high rates repeating over
time. Occasionally a SLOSSS rating may be isolated,
with the TASR showing low rates for time periods immediately
before and after. This may be an anomaly, a temporarily high
rate, not necessarily caused by inadequate roadway characteristics.
Also, Conn DOT has cautioned that some municipalities submit
less complete accident data than others, lowering their state
roadway TASR ratings and clouding their validity.
Some TASR rates are also high, above 100%, but do not
exceed the threshold accident count of 15 to appear on the SLOSSS.
These are "sub-SLOSSS" TASR locations
but still of importance. As a characteristic of the SLOSSS is to be above 100%, all percentages given below that threshold
in the text can be assumed to be sub-SLOSSS" locations.