Trucks extremely busy, 15+ idle trucks

Issue description

I have had an extrememly busy vehicle warning for a while but noticed that I have 15+ vehicles idle for a long period of time as well.

Reproduction steps

Unknown how to reproduce issue

Game version and build number

v0.8.6a (b610)

Operating system

Windows

Attachments

Do you have an island you are bridging towards?

These trucks can only carry loose materials.

The idle trucks in your screenshot can only carry loose materials, so they cannot help with the other cargo that keeps the rest of the fleet busy.