Eva: A "smart highway" system should be installed, one that would monitor areawide traffic patterns and communicate with computers in vehicles or with programmable highway signs to give drivers information about traffic congestion and alternate routes. Such a system, we can infer, would result in improved traffic flow in and around cities that would do more than improve drivers' tempers; it would decrease the considerable loss of money and productivity that now results from traffic congestion. Louis: There are already traffic reports on the radio. Why would a "smart highway" system be any better? . Eva's argument depends on the assumption that ['the type of equipment used in "smart highway" systems would vary from one city to another', 'on "smart highways" there would not be the breakdowns of vehicles that currently cause traffic congestion', 'traffic flow in and around cities is not now so congested that significant improvement is impossible', 'older vehicles could not be fitted with equipment to receive signals sent by a "smart highway" system']