• Who gives the green lightfor every road?

    Who gives the green light
    for every road?

Current traffic state

PTV Epics analyses traffic conditions locally and determines the best control option for the single node based on the situation at hand. The model-based control system decides in seconds whether a phase should be omitted, shortened or lengthened, or if the phase sequence should be changed. PTV Epics also allows the prioritisation of public transport.

In order to operate, PTV Epics must be supplied with data from its own signal control editor - an expanded version of Vissig. Vissig is a module of the PTV Vissim simulation software into which PTV Epics is directly integrated, providing an ideal test setting.

The traffic engineer defines the underlying fixed time signal program and its weighting for PTV Epics, along with a range of other parameters such as minimum and maximum phase duration, and green times for the different signal groups. The engineer also configures the permitted phase sequences and the weighted requirements for private and public transport as well as pedestrians. The weightings for the different elements feed into the total performance index, which summarises e.g. the resulting waiting times and blocking backs during the evaluation of a control option for the node.

In operation, PTV Epics accesses the detector data for the node, uses it to recognise the incoming vehicle flows, and adjusts its simulation model for calculating the effects of different control options based on this. In less than a single second, PTV Epics optimises the phase sequence and its timings by optimising the total performance index. In this way, for example, a bus will receive priority at the intersection if public transport is prioritised by being assigned a high weighting. PTV Epics stands out in particular by being very intuitive and quick to implement compared to traditional rule-based control systems.

Traffic engineers wishing to coordinate signal lights traffic-adaptive over multiple nodes can also implement PTV Balance alongside PTV Epics. As a model-based network control system, PTV Balance transmits the ideal timing for a particular phase to the local signal control system, allowing vehicles to travel down a corridor on a green wave, for example. PTV Epics then adapts the superordinate plan in response to short-term variations at individual intersections and puts the focus on the user's preferred prioritisations.

Working with PTV Epics

Perfectly integrated in PTV Balance and PTV Vissim, nodes can be optimized very easily with PTV Epics.

Using PTV Balance additionally to PTV Epics, you can compare an existing control system with the recommended optimization: The web-based GUI gives information about the Performance Index and displays the level of service descriptively. Furthermore, you can configure the parameter you would like to analyze easily.
Data provision is comfortable working with PTV Epics thanks to its signal editor, an extended version of PTV Vissim’s module Vissig. Here within you can set all stage parameters and interstages. Thus, you can coordinate e.g. green waves.
With PTV Epics you can prioritize specific modes such as public transport at a single node. To do so, you can individualize travel times, calling-point pairs and lane information in Vissig.

Contact Headquarters

Phone: +49 721 9651-300
Email: infoping@vision.ptvgrouppong.com 

Further information

PTV Epics Brochure