Rate Offerings when the External Distance Engine (HERE) uses a fixed limit

Hello Community,

Context

We use HERE as the External Distance Engine, configured at Rate Offering level. HERE does not take the shipment’s actual (rolling) weight into account. It uses a fixed limited weight parameter, so the route and distance depend on the value configured on the engine, not on the shipment weight.

In Italy, road weight restrictions follow these tiers (t): 0-3.5, 3.5-7.5, 7.5-12, 12-18, 18-26, 26-32, 32-44.

Our carrier rates use different, wider weight brackets: 0-3.5, 3.5-7.5, 7.5-11.5, 11.5-26, >26.

The problem

A single rate bracket can span several road tiers. For example, the 11.5-26 t bracket covers the road tiers 7.5-12, 12-18 and 18-26. The correct distance for a shipment depends on its road tier, so we would need to calculate it with fixed limited weight 12, 18 or 26 respectively. Likewise, the >26 t bracket needs 32 and 44.