1. consensus on what is "big" and what is "loud" is politically impossible.
2. In the US at least, all is allowed except for what is explicitly forbidden. 3. So you're going to have to define what is too big and what is too loud to make it forbidden. go back to #1
As long as something is measurable, you can define it, even politically.
"Loud" can be defined as dB, perhaps a distance from the source of the sound or from a neighborhood/business etc. Ex. Any sound you produce much have adequate dampening or distance such that school zones and residential zones do not recieve greater than 75dB from any singular source, nor 90dB from the combination of all sources. Then legally concerts must use different venues, planes must take a more difficult path to avoid the nearby airport neighborhoods, etc. Maybe walls erected next to speedways.
"Big" would probably need greater specification. One that already exists is lane width, so you can base things off that. Ex. Single-axle vehicles may not have a height greater than its width, where width is measured as the distance between lugnuts in the tightened position of the left and right wheels, the greater distance if the front and back wheels are at different distances.
