One of the major issues in the analysis of any traffic system is the analysis of delay. Delay is a subtler concept. It may be defined as the difference between the actual travel time on a given segment and some ideal travel time to that segment. Measuring the delay in the field is difficult to process and different observers may make judgments that could yield different results. For many purposes, it is, therefore, convenient to have a predictive model for the estimate of delay. Delay, however, can be quantified in many ways.

Queue length is one of the most important performance measures of an intersection. By using queue length, other arterial performance measures, such as intersection delay, travel time, and level of service can be estimated quite readily. The provision of timely and accurate performance measures to travelers can save travel time and costs.

RSM usually uses the manual method for Queue length surveys. Depending on the nature of the survey and the client’s requirements, we use digital recording equipment also. We can provide queue length data that can validate traffic and transport models. Queue length surveys can be undertaken by direction or by lane and is measured in either meters or numbers of vehicles at various time intervals according to client requirements.

Collection equipment for queues usually includes a stopwatch and a clipboard with appropriate forms. Special equipment such as delay meters, intersection counting boards or programmed handheld computers may be used, especially when delay, capacity or other characteristics are the end products desired rather than queue lengths themselves. In this case, the use of electronic equipment may significantly reduce data reduction, person, hours.