With the growth of road traffic, governments in countries around the world are under increasing pressure to provide safe roadways for their citizens. In Europe alone, more than 50,000 people are killed each year due to traffic accidents. As a result, there has been an increased focus on road safety, with improvements in the enforcement of traffic laws taking center stage. Increased emphasis on the enforcement of traffic laws has resulted in nearly a thirty percent reduction of traffic accidents, with between fifteen to twenty percent of the reduction due to stricter enforcement of speed limits and stoplight regulations.

A leading producer of digital and analog traffic enforcement equipment is using Moxa video encoders in their new speed detection system. The company is dedicated to the development, production, and installation of both traditional and digital stoplight camera systems and radar systems, and they are well-known around the world for providing top-notch traffic enforcement equipment.

System Description
The client's speed detection system integrates four main devices: the detector, an industrial video encoder, an FTP server, and a workstation for video file format conversion. Each system uses a VPort 351-T as the industrial video encoder, which connects to the detector through a coaxial cable and to the FTP server through twisted-pair copper wire. The FTP server links to a remote workstation located at the regional police station through an xDSL service.

When the detector senses that a speeding violation has occurred, it triggers the VPort 351-T's event recording function. For faster data transmission, the trigger is sent by UDP (User Datagram Protocol), with event number and time stamp marked for convenient tracking. Once triggered, the VPort then begins the transmission of video images to the FTP server, starting from 4 seconds before the event to 4 seconds after the event. The workstation is placed in the police station and used by officers to download recorded video files from the FTP server on a regular basis. The files are converted by the workstation from PES to AVI format.

The VPort 351-T's wide operating temperature range makes it the right choice for roadside environments, which can exhibit both extremely low and extremely high temperatures. Moreover, Moxa provides software customization that makes the best use of the VPort's pre and post-event recording function, so the speed detection system is able to record three speeders in sequence with no problems. With the VPort 351-T's help, the speed detection system is able to provide more efficient traffic enforcement.

Network System Diagram

Key Product
VPort 351 1-channel MJPEG/MPEG4 industrial video encoder
Product Features
	Video stream up to 30 frames/sec at full D1 (720 × 480) resolution
	Pre/post-alarm video recording function for advanced surveillance
	2-way audio supported
	Free VPort SDK and video surveillance software
	-40 to 75°C operating temperature range

Benefits
	Digital solution that is easily accessed from remote police stations without on-site maintenance
	Wide operating temperature range that is ideal for roadside environments
	Pre/post event recording that provides sufficient photo evidence of speeding violation
	Built-in FTP for convenient data download, and UDP and SNMP protocols for optimal transmission
	User-oriented customization services

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