Motor Excess Cargo insurance is designed to provide an extra layer of coverage above the primary layer. The excess insurance is a separate policy and does not trigger until the primary layer has been exhausted.
Since most claims are settled at a dollar amount much less than the primary limit, the excess policy is used much less frequently, often only on a catastrophic basis, and thus costs less.
Excess coverage, however, is becoming much more necessary due to higher values of cargo that some motor carriers wish to haul on any given load. Typically we see these limits with Automobile Haulers, Boat Haulers, Oversize carriers and Pharmaceutical haulers.
Typical Excess limits over the primary: