My dogs were trained never to go in the streets at all. They could go in the run at home or when they were on the fields. Still, as they got older and less able to hold themselves, they did start needing to go in the street so I had to adapt by being prepared.

If they poop, I have poops bags that I pick it up with and out it in the bin when I get home or a bin in the street. We have a couple near me that have a part for dog waste.
With urine, they generally prefer to do it on a grass verge rather than on concrete but you can't pick that up anyway and it dries up quickly as well. Urine is sterile so it isn't going to cause the same hazards as what a stool can. It can smell if it accumulates and lingers but that doesn't happen out on the street with the odd pee.

In the UK, it is an offence to not clean up after your dog if it passes a stool anywhere meant for public use such as pavements and grass verges next to roads with a speed limit of 40 MPH or under, playing fields, parks etc....
It doesn't apply to agricultural land, common ground, waste ground and general countryside etc....
If people are caught not cleaning up after their dogs in areas covered by the law, they can be fined. Doesn't stop a lot of them though. Still, it is becoming increasingly unacceptable generally and anyone who does lets their dog foul and doesn't clean it up will receive objections from other people at some point or another...or even reported.