Include a photo or give some dimensions of the whole yard for a better answer. It also depends on how much traffic and at what speeds people drive on this side road. If it is a short cul-de-sac, and people have such a short distance to get to their own house that they tend to slow down, the sight lines can be much less. It also depends on how much of your inside the screen/private yard space you need to keep to make it look right from the house. Your greatest risk is that you can't see a pedestrian or dog approaching the driveway, so I'd think you would want at least 15 feet clear of the curb. Cars coming by you can usually hear, it is people,kids and animals that are of more concern. In any case, you will hopefully not be having to constantly back out of your drive onto the street, which is even more dangerous for hitting unseen things. You also don't say how high a screen you intend, as this will make a difference too.

Your town's street and road requirements may be defined by state highway regulations, ours are. That is, the state definition of "driveway" is the assumed meaning in our town ordinances. Ours (and the state's) happens to say that two driveways cannot be within 50 feet of each other. Needless to say, there are many grandfathered exceptions all over the place. In any case, I believe it says "driveways" when the concern is clearly about having two entrance/exits too close to each other. I didn't look it up this time, but I think I remember seeing a definition of "driveway" in the state standards as well the requirements for design and construction. Be aware that such things are not always statutory--the highway dept. may simply have statutory authority to establish standards that are then enforceable. So even though you don't find the definition in an actual statute, it may still carry the weight of law. Does that make sense? Anyway, if your town's standards are based on state standards, you may find something useful there. However, taking that a step back, you may want to check the charter of the highway dept. or permitting dept. to see if authority for setting design and construction standards was delegated to whomever you are dealing with now. Also, be aware that there is no such thing as "the town." There are many different and different kinds of people who work for the town and who represent it in the governing body. If you are dealing with a road agent or similar employee, take your query (politely) up the chain. Appeal if there is a process or find out how to accomplish your goal (e.g., getting a special exception or variance, both of which would put you in front of a different town body than the one with which you are dealing now). At the end of the day, town bodies can be powerful on such little things because most people aren't going to pay out of pocket to be "right" in court about something that isn't actually all that important. Ours recently magically transformed all private driveways serving more than one residence into a new thing called a "private street"--subject to all kinds of new regulations and the odd experience of having the town name our property (when it insisted it had the right to name the "private street"--long story).

Once RoundUp dries, it's harmless.. Just keep the pets away until it dries. I use RoundUp to take out certain weeds in my lawn for which there isn't a selective control. For example, Orchardgrass. A bag of fescue was contaminated with the stuff, and I've got Orchardgrass all over the place. The Ready-To-Spray pump I bought has a foam option on the squirt gun attachment that came with it. The foam makes it easier to control because there isn't much risk of collateral damage. Because the Orchardgrass grows about twice as quick and twice as tall as TTTF, it's pretty easy to manage. Sadly, there so much orchardgrass in my backyard that I'm starting to feel the need to spray the entire yard with RU this summer to kill it all, and then do a total rennovation.

There's a couple big plants in full shade on Isola Madre - summers about 80/62, sunny compared to the UK but also quite rainy (about 6 inches a month) so, somewhat cool nights. Maybe a quicker mix-down at night...I remember a cool breeze sweeping down from the mountains that didn't feel like something we'd typically experience in the eastern Piedmont. All that probably keeps the soil quite a bit cooler than a typical US garden in non-maritime climates. I've also heard of them being grown in cooler summer parts of New England, with massive winter protection. I've tried about 3 over the years, they seem to die around here once mid-summer's sustained temps hit the mid 80s and nights the mid 60s or sometimes above. I understand they are mostly grown in partial shade in the PNW (76/55 or so, when you average in warmer Portland, etc...and a prolonged dry, sunny spell in summer.) OTOH in places like Scotland (avg. 68/54, cloudy damp summers) you can see them growing in almost full sun by pond edges and damp spots...though they will also grow in shadier spots too. "Cool and misty, San Francisco is the place!" It's all relative. San Francisco is actually very sunny compared to some of the world's other Csb/Cfb climates. (and, really, the fact it isn't considered a Cfb climate should tell us something...) Even in California itself, there are places like Eureka that are cooler at least, if you mean cool in summer.