Creating a traffic simulation model is a team game. Twenty years ago, due to the expense and effort involved, models were developed only for larger regions using mainframe programs. A typical team consisted of experts on traffic, land use, computers, data collection, graphics, and, of course, project management.
With the advent of microcomputers, a traffic model is now sometimes developed by an individual who is relatively new to the field. Why? Because he or she is not yet overburdened by other responsibilities, and because he or she is not afraid to use a PC.
Is the development of comprehensive and user friendly software packages such as TMODEL2 intended to allow one inexperienced person to replace a team of experts? No!
These programs are created to provide powerful, yet easy-to-use tools right at your fingertips. However, building a model still requires a vast amount of detailed data, expert decisions on application of behavioral rules and function parameters, much local knowledge, and a continuous view of the big picture.
Maintaining the big picture while being immersed in the thousands of details needed as model inputs, having an experienced view of traffic operations, as well as the knowledge of local conditions, all require a combination of abilities few of us possess. So, do we just throw up our hands and walk away? Heck No!
Assemble a team of 4 people to plan, work on, advise on, review, and otherwise participate in the creation of this mathematical simulation traffic model. Whether I am a planner, geographer, or engineer working in a jurisdiction, the principles are the same. If I am the modeler, I need to involve people who really know the network, the area's land uses and traffic operations, the software, the theories behind traffic modeling, and project management.
We suggest formally establishing these relationships, assigning responsibilities, and sharing in the success of the outcomes as well as installing oversight committees and reporting to them regularly and completely. Convince all participants of the importance and necessity of their roles. Give credit where credit is due. Above all, maintain the big picture.
Many of us modelers succumb to the delusions of our own infallibility. Many bosses succumb to the cost controlling decision to minimize these overview and communication meetings. Many models are not good.
Modeling is a complex business. Establish a good team, don't be afraid to ask them for help, and you will be much more likely to reap the benefits of creating a useful tool for traffic prediction and analysis. For more concrete methods and suggestions, contact us at TModel Corporation and we will gladly share our experiences with you.