Sec. 2. CLASSIFICATION AND RECORD OF ROADS. (a) The county engineer shall, under the direction of the commissioners court, and as soon as practicable, classify all public roads in such county, and such classification when completed, and when approved by the court, shall become a part of the permanent records of roads and bridges of said county. He shall prepare a suitable map of which shall be delineated in appropriate colors the various roads which shall be designated as first, second, and third class roads. The map shall show to which place each road belongs and the nature of its construction. He shall make a complete indexed record of each county road in the county and all bridges. The records shall show when each county road was dedicated to the use of the public, a complete description as to location, measured length, width of right-of-way, character of construction, and terminals of same.

(b) Each road shall be indexed in the record by the same number and name as it is delineated on the map. As new roads are opened and improved, and the existing roads are widened or improved so as to change their class, such facts shall be added to the record of such roads in the "Records of Roads." Such information shall be made available to the public; provided, however that any omission in respect to the above requirement shall not invalidate any contract for the construction or repair of any road or highway in said county, and where such classification, records and indexes have heretofore been prepared there shall be no necessity to repeat the same in the absence of public necessity therefor, but same may be amended, added to or taken from as the facts of public need may demand.