Seat belt 1967, Volvo started to install lap belts in the rear seats. In 1972, Volvo upgraded the rear seat belts to a three-point belt. In crashes, unbelted rear passengers increase the risk of belted front seat occupants' death by nearly five times. As with adult drivers and passengers, the advent of seat belts was accompanied by calls for their use by child occupants, including legislation requiring such use. Generally children using adult seat belts suffer significantly lower injury risk when compared to non-buckled children. The UK extended compulsory seatbelt wearing to child passengers under the age of 14 in 1989. It
The Wearing of the Grin in fewer solo cartoons. All of Porky's subsequent appearances in the classic era would be with other characters such as Daffy or the non-speaking, house cat version of Sylvester. The title refers to "The Wearing of the Green", an old Irish ballad, while the green shoes themselves are borrowed from the Hans Christian Andersen fable "The Red Shoes" (and the 1948 film based on it) about a pair of ballet shoes that never let their wearer stop dancing. The title was parodied, also as "The Wearing of the Grin", in the Bugs Bunny cartoon "What's Up, Doc?", where Bugs reveals