FYRRFirst Year Rate of Return
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The third constraint of infinite asset life poses the largest issue for the FYRR, as most road infrastructure projects do not have an infinite life.
The finite evaluation period of road projects undermines the strength of the FYRR as an indicator of the optimal start time for a project, as delaying a project creates the possibility of additional benefits from an additional year of life when a project is delayed.
The ATC guidelines suggests the use of the NPV as a determinant of optimal timing as an alternative to the FYRR.