MOVA stands for Microprocessor Optimised Vehicle Actuation. Originally designed by TRL during the 1980s, it is now a very well established strategy for the control of traffic light signals at isolated junctions – i.e. junctions that are uncoordinated with any neighbouring signals. It can also be used at stand-alone pedestrian crossing, i.e. Puffin and Pelicans. Currently Traffic Solutions have over 150 sites equipped with MOVA with each year seeing additional installations. MOVA is now often deployed as a linked schemed.
MOVA is designed to cater for the full range of traffic conditions, from very low flows through to a junction that is overloaded. For the major part of the range – before congestion occurs, MOVA operates in a delay minimising mode; if any approach becomes overloaded, the system switches to a capacity maximising procedure. MOVA is also able to operate at a wide range of junctions, from the very simple ‘shuttle-working’, to large, multi-phase multi-lane sites. MOVA control is ideal for standalone pedestrian crossings particularly ones with high speed approaches making the crossing safer for both pedestrians and motorists.
MOVA is particularly well suited to the following:
Sites with high traffic flow, particularly where these are seasonal or intermittent (for instance, motorway diversion routes and holiday routes).
- Sites experiencing capacity difficulties under VA control with congestion on one or more approaches.
- Sites with high speed approaches and/or red compliance problems.
- Where additional capacity is required to allow pedestrian facilities or safer staging structure to be introduced.
- Where more than one junction is situated too close to be considered as isolated, there are ways in which two or more junctions can be linked by the use of MOVA control. Partially or even fully signalised roundabouts are a good example of a MOVA linking opportunity.
- Puffin crossings where the call-cancel demands from kerbside detectors can be dealt with correctly and the identification of gaps in traffic can be considerably more effective than D-systemVA.
RMS Using the latest Gemini² technology the Siemens MOVA/OMU unit is an extension of the well proven Remote Monitoring Outstation (OMU) providing both MOVA and full OMU functionality in a single 3U unit.
Implementing the latest version MOVA 7, Siemens provides single and up to and incorporating four stream control of traffic signals at isolated junctions, and caters for the full range of traffic conditions – from low flows operating in ‘delay minimising’ mode to heavy congestion by switching to ‘capacity maximising’ mode.
It is particularly effective for relieving congestion at intersections where traditional Vehicle Actuated methods of control are inadequate.
TRL approved implementation, running MOVA 7
- Single or up to four stream control
- Well proven hardware platform, fully integrated with Siemens Remote Monitoring Outstation Monitoring Unit (OMU)
- Easy access using the advanced Siemens RMS Instation
- Very close integration with Siemens ST800 controller family, providing semi-integral functionality via controller handset port
- Able to interface to any controller that can accept standard force and confirm bits
- Supports communications via standard PSTN and GSM networks enabling the most cost-effective infrastructure to be used