MouseEars1973; for the smaller kids I think the "only" real risk are those not used to handling an
ECV, power or manual wc (and yes; also those who push the chair can be very dangerous!). Those who are used to rely on those aids KNOW small children are running around and can suddenly step in front of you at a unexpected moment. I've used an ECV for some years, used a manual (an still do) since 7 years and am a newbe in a powerchair.
Being in crowded places, or any place with younger kids, I watch them and expect them to jump in front of me at the last moment. (might have something to do with my manual being too cool and attractive to them with all the colours and lights

) Because of the fact that I know they're just kids and can't be considered capable of knowing the risks involved, it will very rarely happen that there will be any physical contact. Never even happened, know on wood. I give small children more leanway (as they deserve) and would never mind waiting a bit longer for them.
Adults are a different story all together! While some are great, most simply don't have a clue about the possibilities and more important; boundaries thereoff of these aids. They jump in front at the weirdest moments, literally run into me looking me in the face!, stopping out of nowhere to look at something while I'm just behind them, stand talking right in the middle of an aisl in the shop so you can't pass them at either the left or the right etc. They really do think that I can just stop in half a second, where it simply takes the aid (or my hands in case of the manual) some time for being at a stop. Not because I don't want to or react slower, but simply because it's technically impossible. Nor does any "walker" seem to realize that sitting down at a lower level than those surrounding me, gives me very poor visability and less time to see (possible) problems coming for some extra meters. I simply can't see past the first bumm in front of me.
It isn't "walkers" wanting to be rude or being a pain in the you-know-what, it's simply being uninformed. With most of those with any form of wheels under their bum it's just the same. They aren't rude, they aren't blind to their incapability, it's plain and simple lacking knowledge.
And than again, you've got those rude annoying people. As we're all people, they come in every shape and form including the "walkers" and "wheelers". If you ask me, there could be some more etiquette from both sides. I consider it plain rude if anyone drives down busy places like mainstreet at a speed higher than the slowest possible speed for their aid. There's no need to speed and it increases the risk of problems. Just like I consider it rude if people jump in front of me when I am pulling up to a waitingline just a bit earlier, just because they know I'm not as fast and flexible with the chair as they are walking and it'll safe them like 1 whole person in line waiting.
In the case of the elderly mother using an
ECV and KNOWING she has problems controlling it regularely, I would find it offensive to run into those persons in a public place that's either busy or where there are likely to be small kids. It's plain dangerous. It's very hard to be dependant, but independence never should compromise the safety of oneself or anyone else. If she has moments of her hands slipping; the EVC she's using isn't right for her. There are very many extra aids and possibilities on the market to help so these "slipping out of control" is unneaded. For instance; they can change the gashandle to a footpeddle, they can change the standard gashandle to one that fits the persons function of the hand. Might not get everything covered and something are no way near cheap, but that's simply no excuse for me.