Transportation is very important issue in everyone’s life as the things need to be carried from one place to another. It plays a vital role to transport various health equipment’s, groceries, and daily needs of the people from outside and inside the country. The intelligent transport system (ITS) is actually a system that uses the digital technologies to smoothen the transport system helping them to overcome the issue of accidents, reduce the pollution, reduce the traffic congestion on roads, and help them in delivering the services timely. Many researchers integrated various virtual technologies to propose the best ITS. In this work, the existing work on the ITS done in the last 20 years has been analyzed to address various issues and problems in the existing ITS models. The security aspects have also been addressed along with the various vulnerabilities and solutions to protect ITS. We provided a comprehensive study of existing literature on ITS, their highlights, merits, and demerits. The research papers focused on ITS have been analyzed and at last out of 80 research papers best 70 were included in this work for the study of ITS. The objectives of this study are to provide insights to the beginners of this research area and to analyze the existing solutions aiming to provide the ITS. The future research directions have also been proposed in this work.