I'm going to jump in and play devil's advocate once again:
I think everybody should be free to have their own garden on their property, however, I do believe it should be in either the back yard, or in a fenced off area.
Not because I think it looks bad or anything superficial like that, but if it's anything like the rules for having a pool, there are certain safety concerns to keep in mind.
My father has a pool in the back yard, and by regulation, it must be closed off in order to prevent idiot kids or neighbors from strolling in and drowning.... which I think is stupid, but at the same time, holds some logic to it as it helps prevent you from being found liable for their deaths.
Now in relation to a garden in your front yard, similar issues can apply. For one thing, having a garden near a roadway will pose health risks to the veggies & fruits you grow, due to litter, regular salting & plowing in the winter time, and a bunch of other contaminants that could seep into the soil, into the plants and then into you. And if you get sick from eating that stuff, there's a chance the city/town could be sued or held liable for that illness.
The second aspect is people walking by and either swiping all of the veggies and fruits from your garden, which opens up court cases of theft, or merely having to constantly get the police involved every time someone is missing a tomato...... or in relation to the above, someone taking something from that garden, gets sick from either the chemicals that were absorbed due to being near the road, or due to the pesticides or other things you put on those plants..... and then suing you..... even though they ate it without your permission, I wouldn't be surprised if someone sued anyways and probably win.
In a perfect world, I wouldn't have a problem with people growing a garden in their front yard, but there comes risks of liability if something goes wrong, someone gets sick, or their garden is constantly robbed by passer's by.
Just keep it in the back yard, I don't see what the big deal is.
Added:
Oh and then there's the issue of rodents and vermin near sewer drains picking away at your garden.