Section 5: Bridges, Including Bridge-Classification CulvertsAnchor: #i1005971
Where minimum bridge widths exist, it is generally expected that no additional structural work will be necessary. However, existing conditions such as deficient railing (pre-1964 rails are typically in this category), deteriorated deck, or a structure which has an unsafe load carrying capability may require additional structural work. In such cases, the Bridge Division should be consulted for design recommendations. If structural modification is necessary, it may be appropriate to consider a greater bridge width if future plans or traffic projections indicate additional roadway improvement will be necessary in the foreseeable future.
To accomplish a complete and cost effective rehabilitation plan throughout a geographic area, roadways with low traffic volumes should have a crash evaluation conducted on structures with railings which do not match current standard railing details. It is important that bridges with these railings be evaluated on an individual basis. If the evaluation indicates continuing satisfactory performance and the railing is in good repair, these railings may be retained on low volume roadways.
Additional information on bridge rehabilitation may be obtained by referencing the Bridge Project Development Manual.
Note that additional vertical clearance requirements may apply to bridge projects on the Texas Highway Freight Network (THFN) as specified in Chapter 3, Section 8.