The sign you mentioned, "Junctions of the highways one- or two-digit number," indicates the beginning of a motorway junction where the actual number of the junction is displayed beneath the sign. This number is used for navigation and reference purposes, helping drivers identify their location on the highway.

When you see this sign, it means you are approaching a designated exit or junction on the motorway. The number attached to the sign allows drivers to know exactly which junction they are at, making it easier to plan their route and manage their expectations regarding upcoming exits.

If you have any specific questions or need further clarification about this sign or related rules, feel free to ask!