Limit Working Hours With Permits
Require companies that have over "x" amount of employees to apply for and be issued permits for each time slot an employee works.
The city would limit how many drivers are on the road by limiting the percentage of employees that could work during each time slot. A designated number of permits would be allowed for 7-4, 8-5, 9-5 and so on.
Certain types of industries such as construction where work really needs to happen during daytime hours could be exempted.
What would be interesting would be to count a census of cars that are NOT driving to work first to see how many permits should be issued for each time slot. Would it be possible to ask all companies/most companies to have their employees stay home/work from home and request that citizens that do not normally drive to stay home if at all possible while traffic on our major roads is counted? I can see it now, Happy Traffic Census Day!