| (A) Periodic rechecks of all zones are desirable at intervals of about three to five years in urban areas regardless of roadway improvements, roadside developments, or increases in traffic volumes. Trial runs or rechecks of every third speed check station may be made. (B) Rechecks in rural areas are desirable at intervals of five to ten years. In many instances, trial runs may be sufficient. (C) If the speed checks or trial runs indicate a need for revision of the zone, rechecks of speeds should be made at all speed check stations for that particular section. (f) Environmental speed limits. (1) Existing environmental speed limits. Existing environmental speed limits created at the request of the Texas Commission on Environmental Quality (TCEQ) may be retained on the state highway system until such time as: (A) the TCEQ advises the department in writing that the speed limit is unnecessary; and (B) a speed study performed for the area finds that the existing environmental speed zone is not reflective of the 85th percentile speed as determined by procedures detailed in this subchapter. (2) New environmental speed limits prohibited. As per Transportation Code, §545.353(j), no new environmental speed limits may be created on the state highway system. |
| Source Note: The provisions of this §25.23 adopted to be effective December 9, 2004, 29 TexReg 11389; amended to be effective March 16, 2006, 31 TexReg 1728; amended to be effective May 20, 2010, 35 TexReg 3859; amended to be effective October 20, 2011, 36 TexReg 6968 |
