Evaluation of any traffic management policy is based on before and after study. There is no standard or ready made solution to a traffic problem. Each problem is to to looked considering the local conditions.

for delays a good starting point might be the HCM

In Brazil, the quality of service on rural highways are determined based on HCM. However, there are studies that have been produced to create appropriate methods to evaluate these roads. Some papers were published in english, but others are not published yet.