Definitions for "Design Life"
The expected lifetime of a power supply during which it will operate to its published specifications.
The period during which the quality of a structure, eg. riding quality of a pavement, is expected to remain acceptable.
Projected life (in years) of a new structure or structural component under normal loading and environmental conditions before replacement or major rehabilitation is expected.
The number of years into the future while the intersection operates satisfactorily considering increases in traffic demand volumes.
The period of time a converter will perform to its published specifications. Random failure is not a factor.