|(a) This section applies only to decreasing the speed
limit within an existing speed zone on the state highway system if
the crash rate in the section of the roadway is greater than the statewide
average crash rate for similar roadways.
(b) The speed zone study that is necessary for reducing
the speed limit is limited to the determination of the 85th percentile
speed or trial run speed at one or more speed check locations within
the established speed zone and consideration of the following factors
that are applicable:
(1) narrow roadway pavement;
(2) horizontal and vertical curves;
(3) high driveway density;
(4) lack of striped, improved shoulders; and
(5) crash history within the speed zone.
(c) The speed limit posted under this section may be
as much as 12 miles per hour below the 85th percentile speed or trial-run
speed that was used to determine the speed limit that is being reduced.
The final decision on the amount of the variation should be based
on the engineering judgment of the supervising engineer.
(d) The provisions of this subchapter related to establishing
a speed limit apply to an action under this section unless such a
provision conflicts with this section, in which event this section
controls to the extent of conflict.
(e) A strip map is not required under this section.