limit within an urban district may be decreased to less than
twenty-five (25) miles per hour under subdivision (1).
(b) A local authority in the authority's jurisdiction shall determine
by an engineering and traffic investigation the proper maximum speed
for all local streets and shall declare a reasonable and safe maximum
speed permitted under this chapter for an urban district. However, an
engineering and traffic study is not required to be performed for
the local streets in an urban district under this subsection if the
local authority determines that the proper maximum speed in the
urban district is not less than twenty-five (25) miles per hour.
(c) An altered limit established under this section is effective at all
times or during hours of darkness or at other times as may be
determined when appropriate signs giving notice of the altered limit are
erected on the street or highway.
(d) Except as provided in this subsection, a local authority may not
alter a speed limit on a highway or extension of a highway in the state
highway system. A city or town may establish speed limits on state
highways upon which a school is located. However, a speed limit
established under this subsection is valid only if the following
conditions exist:
(1) The limit is not less than twenty (20) miles per hour.
(2) The limit is imposed only in the immediate vicinity of the
school.
(3) Children are present.
(4) The speed zone is properly signed.
(5) The Indiana department of transportation has been notified of
the limit imposed by certified mail.
(e) A local authority may decrease a limit on a street to not less than
fifteen (15) miles per hour if the following conditions exist:
(1) The street is located within a park or playground established
under IC 36-10.
(2) The:
(A) board established under IC 36-10-3;
(B) board established under IC 36-10-4; or
(C) park authority established under IC 36-10-5;