Rescale z_order and treat links the same as base type

[pnorman]

Currently all orders are divisible by 10. The z_order would be easier to work with if all current orders were divided by 10.

At the same time, we should make highway=X and highway=X_link have the same z_order, then add link status to the order by in the queries.

[sommerluk]

we should make highway=X and highway=X_link have the same z_order, then add link status to the order by in the queries.

What would be the advantage of this change?

[pnorman]

What would be the advantage of this change?

Without an increase in query complexity it gives us more flexibility, cleaner z_order selection, and is clearer as why the values are different. It allows foo and foo_link to be treated the same which right now is not true.

[jeisenbe]

This has to be done at the time of database reload, correct?

[pnorman]

This has to be done at the time of database reload, correct?

Yes

[jeisenbe]

The z_order would be easier to work with if all current orders were divided by 10.

I could still do this in #4055, though it will require changing more values, since the construction= values need 18 unique numbers.

Is that worthwhile?

[pnorman]

Thinking about this, it's not going to work with our peculiar ordering of links between high-class roads and low-class roads.

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I could still do this in #4055, though it will require changing more values, since the construction= values need 18 unique numbers.

Is that worthwhile?

No.