What is wrong with the construction area sign in this picture?
The sign is covering more than 50% of the barricade rails. Chapter 6 of the California Manual on Uniform Traffic Control Devices offers the following guidance,
Signs mounted on Type 3 Barricades should not cover more than 50 percent of the top two rails or 33 percent of the total area of the three rails.
On addition, the sign is too low to the ground,
The bottom of a sign mounted on a barricade, or other portable support, shall be at least 1 foot above the traveled way.
If the sign will be in place for more than 3 days and is considered a long-term closure, it should be mounted with 7 ft of clearance between the ground and the bottom of the sign,
Guidance:
11 Except as provided in Paragraph 12, signs (see Figures 6F-3, 6F-4 and 6F-5) mounted on portable sign supports that do not meet the minimum mounting heights provided in Paragraphs 4 through 6 should not be used for a duration of more than 3 days.