Based on your description of a color palette suited for an architectural layout with distinct zones, here is a tailored color palette that avoids dark tones and incorporates a police zone blue while excluding a strong green for the engineering infrastructure.

json
{
  "palette_name": "Urban Zone Palette",
  "colors": [
    {
      "name": "Sky Blue",
      "hex_code": "
          
          #87CEEB
       "
    },
    {
      "name": "Soft Yellow",
      "hex_code": "
          
          #FFFACD
       "
    },
    {
      "name": "Light Gray",
      "hex_code": "
          
          #D3D3D3
       "
    },
    {
      "name": "Coral",
      "hex_code": "
          
          #FF7F50
       "
    },
    {
      "name": "Powder Blue",
      "hex_code": "
          
          #B0E0E6
       "
    }
  ]
}

Palette Description:

This palette features a combination of light and inviting colors, perfect for urban planning and architectural designs. The Sky Blue represents the police zone, providing a calm and secure feel. The Soft Yellow can indicate areas like transport, adding warmth and brightness. Light Gray can be used for garages or neutral spaces, while Coral adds a pop of color for attention in specific zones. Lastly, Powder Blue complements the police area without being overpowering, maintaining a cohesive look throughout the design.

Do you have any specific zones in mind that you would like to highlight further, or do you need additional colors for other areas?