Google Maps calculates only one route when going from A point to B point twice.

[jonathadv]

Use case that works: User wants to go from A point to B point and back to A point.

• Acesso J 187 Vila Nova Porto Alegre
• Dublin Porto Alegre
• Acesso J 187 Vila Nova Porto Alegre
  Returns: 29.503km

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Use case that doesn't work: User wants to go from A point to B point and back to A and go to B again.

• Acesso J 187 Vila Nova Porto Alegre
• Dublin Porto Alegre
• Acesso J 187 Vila Nova Porto Alegre
• Dublin Porto Alegre
  Returns: 14.301km (the expected value would be ~43.804km)