Service businesses often begin with a radius: Melbourne, the north, the south-east, or every suburb within an hour. That tells me where the van can go. It does not tell me which work is profitable, where the team has capacity, what customers need, or which page should answer the search.
The first map belongs in operations. Record where the business will travel, which services are available there and where jobs are routinely declined. Then compare that with real enquiries, Search Console queries, profile data, call records and completed work where those records exist. Do not fill the gaps with made-up keyword volume.
A strong service page can mention an honest service area without spawning dozens of copies. Separate location pages come later, after the evidence shows that one area deserves a different answer.