1. Introduction
Recently, the intelligent traffic system (ITS) has been developed to make the existing traffic infrastructure more efficient. The most common sensor for ITS is the magnetic loop detector which is used to measure the length and the number of axles of vehicles. Based on the measurement, the types of vehicles can be identified. Since, these detectors are imbedded beneath the road, they have high failure rates due to pavement failures and poor maintenance. The vision-based video monitoring systems are more cost-effective.