Services \ Saturation Flow and Degrees of saturation
Saturation Flow and Degrees of saturation
Saturation flow count definitions are consistent in the available reference material, the method for measuring saturation flow on site is sometimes inconsistent and unclear. This information sheet provides essential information for obtaining and understanding saturation flows and also the engineering judgement required for on-site measurement and subsequent calibration of saturation flows. This is intended to be a best practice guide, however, the modeller may choose to follow the available reference documents and use engineering judgement when determining suitable saturation flows for modelling and analysis purposes.
Saturation flow is an important calibration and validation parameter used in traffic modelling. Saturation flows have significant impacts on network performance, such as capacity, delay, queues and degree of saturation.
Where traffic modelling is utilised to assist in the design of new intersections or modification of existing intersections, the accuracy of the models is critical to evaluate the impact to the road network if implemented on site. It is therefore critical to measure saturation flow accurately for modelling.