State rules or regulations that require 24 hour maintenance of temporary traffic warning devices along highway work zones

From Section 104.05 of the Idaho Standard Specifications:
“The Contractor is responsible for monitoring and maintaining traffic control devices during non-working days and non-working hours. During non-working hours, an individual shall be available to perform maintenance of traffic control devices as necessary. Such individual need not be on duty, but shall be readily available by telephone contact. During non-working days, such individual shall review the project traffic control at least once per day as authorized and perform any maintenance required. Payment for monitoring will be paid as Traffic Control Maintenance when authorized during non-working hours.”
“The Contractor’s maintenance work shall be continuous and effective so that the roadway and structure are kept in a satisfactory condition at all times.”