  The goal of this paper is to revise the Henderson-Chu approach by dividing
the commuters into two income-based groups: the `rich' and the `poor'. The rich
are clearly more flexible in their arrival times and would rather have more
schedule delay cost instead of travel delay. The poor are quite inflexible as
they have to arrive at work at a specified time -- travel delay cost is
preferred over schedule delay cost. We combined multiple models of peak-load
bottleneck congestion with and without toll-pricing to generate a Pareto
improvement in Lexus lanes.
