The brown sign for Langley Flat Provisional School 1927-1928 is in a field on Cooks Rd off Burnett Hwy.
Langley Flat Provisional School first opened as Springfield State School in November 1911, closing 10 years later in December 1921. It opened for a short period between July and December in 1922 to support Jimbour State School.
In 1927 the school reopened full-time in 1927, until 1929 when it was reopened as Langley Flat State School at a nearby location on the Burnett Hwy.
I visited the location at Burnett Hwy with a brown sign for Langley Flat School 1929-1946 
. The dates didn’t match with the Queensland government archive details (see the link is below).
I found a pin on Google Maps for Langley Flat Provisional School 1927-1928. The photos for this destination have generously been provided by Eddie Otto, who created the pin on Google Maps.
Having found an alternate location for earlier years of the school, there may be another location for the period 1921-1922.
If this destination is the same as Langley Flat School, there isn’t much to see with the remnants of the school lost in time.
Thank you to Eddie Otto for providing the photos so this brown sign destination can be added.
Another brown sign exists for Anyarro Provisional School 1928-1929 a few kilometres to the west.
Links
http://www.archivessearch.qld.gov.au/Search/AgencyDetails.aspx?AgencyId=9100