During the getaway from one such incident, the erratic driver causes a flatbed truck loaded with cylinders of nitrous oxide (laughing gas) to spin out of control.
As the cylinders crash to the sidewalk, some of the valves break sending gaseous fumes everywhere - and Ponch accidentally breathes in some of the gas at the accident scene and becomes loopy.
A broken down motorist takes out his anger on his old car, a small 'plane lands on the highway, and while on a date, Ponch receives a ticket and decides to attend traffic "school" to hide the citation from Getraer.
A down-and-out vet lifting purses from women in traffic jams turns out to be a former classmate of Jon's, while an elephant breaking out of her circus wagon during a freeway accident, and teenagers joyriding complicate life even more.
Jon and Ponch must carry out their patrols in a car during a rainy day and deal with a compulsive gambler and a string of carjackings.
While Ponch and Jon resolve a confrontation at a gas station, Grossie and Sergeant Getraer come across an accident caused by an oil truck.
While there, they help an orphaned 10-year-old girl find a new home, arrest a councilman's two sons and city manager's daughter on some serious traffic charges, and uncover an illicit sales headquarters of a group of hijackers.
The leader of the gang challenges Steve's older brother to a final showdown to win the title of King of the Indy.
The duo goes after a pair of health-club thieves and find a runaway teenage mother who has stolen back the baby she sold.