The more comfortable the street environment, the more likely people will walk and bike to get around, benefiting the individual and surrounding community. Fast traffic that’s rushing by, a foot away, makes vulnerable road users unsafe. Vehicles that are loud and expel smelly exhaust, create an uncomfortable space for those not enclosed in a vehicle.
Studies have shown that traffic noise decreases work performance; and increases depression, anxiety, and diseases. (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5898791/)
Cars, motorcycles and scooters that have likely had their exhausts modified to make them loud and more polluting must be regulated. Some say they need to be loud to be heard and seen on the streets, but this has been debunked by studies. Also, removing the muffler doesn’t increase the motorcycle’s performance, instead, it can damage the engine components. (https://www.motorbiscuit.com/
and animals – https://youtu.be/i9qMbTba6qk