The traffic sign "Time specifications hours restricted to weekdays 1042-38" indicates that a certain regulation or restriction applies only on weekdays during specific hours. The sign typically features a timeframe, such as from 8:00 AM to 6:00 PM, and shows that the rules enforced by the sign are applicable only during those hours on weekdays, usually Monday to Friday.

This kind of sign might be used for various purposes, such as parking restrictions, loading zones, or speed limits, meaning that outside the specified hours or on weekends, the restrictions do not apply. Always check for additional text or symbols that provide specific details on exact rules or limitations imposed by the sign.