How to make Traffic Jam

 First, prepare your pots. Pre-season with a deluge, smeared well right up into the nooks and crannies of your headwaters then let it flow well towards your cooking range. This can be prepared up to 3 days in advance.

Ingredients:

• 3/4 of the people in a 200km radius who needed to come into town in the last 3 days 
• 3/4 of the people who have wanted to leave town in the last 3 days
• 3/4 of the people who had been working from home heading into the office after 3 days (i.e. Jeanie)
• 3/4 of the school students returning to school after 2-3 days (i.e. Paris)
• 3/4 of the rubbernecker's doing a little flood tourism 

Method:

Put all of the above into cars on any of the 3 ways Jeanie can travel to work.

Open both bridges across the river.

Let jam set.

For additional spice, ensure that at the very end of this colossal trip Jeanie should remember that she forgot one vital item for returning to work.

Yep. The laptop was still in Paradise.