Best Practice

BEST PRACTICE:

A4−1: Work Zone Performance Goal – Maximum Delay Specification

DESCRIPTION:

A number of States have adopted work zone mobility performance goals such as maximum delay specifications. For example, the Wyoming and Oregon Departments of Transportation (DOT) have 20−minute maximum delay rules in effect for work zones. Massachusetts DOT has had a 12−minute work zone delay rule in effect for over 15 years. Analyses are performed, during design, based on expected traffic volume and capacity reductions due to work zone operations to estimate anticipated delay. If the expected delay approaches or exceeds the performance threshold, alternative construction strategies, work hours, or other transportation management strategies are considered.

REASON(S) FOR ADOPTING:

This specification was adopted to minimize delay to motorists. A design practice was needed to give insight into the reduction of congestion through work zones. It helps in preparing and understanding such issues as stage construction and allowable work hours.

PRIMARY BENEFIT(S):

This type of approach can be beneficial for both the motorist and the contractor. It allows the contractor to perform work that delays the public, but limits this delay to a specified amount that is considered tolerable. Allowing some delay can make the contractor's approach to their work somewhat easier than if no delay were allowed. It allows motorists to continue to use existing routes without unreasonable delays or detours.

MOST APPLICABLE LOCATION(S)/PROJECT(S):

This practice is applicable to major construction activities. It is especially applicable to environmentally sensitive or remote rural locations in which major construction activities are performed under traffic because no reasonable detours exist.

STATE(S) WHERE USED:

Massachusetts, Oregon, Wyoming

SOURCE/CONTACT(S):

Neil E. Boudreau, State Traffic Engineer, Massachusetts DOT
Phone: (617) 973−8211
E−mail: Neil.Boudreau@state.ma.us