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Hedges or trees would also work, they look nicer.
I have mixed feelings. Hedges and trees block vision. They can be done well, but I have seen a lot of places where they made traffic less safe.
Trees give a nice shade canopy and help reduce the noise level of a an otherwise loud city street, plus they can reduce the heat island effect that's a near constant in our concrete cities
I had a recent trip take me both into Manhattan and the Chicago Loop and it was night and day how loud the one with more mature trees to break up the echoey canyon of concrete and glass was than the other, despite the other having more vehicle traffic at that moment
Hedges can be low enough that pedestrians are visible. Trees typically have their branches well above car height. So nothing is obscured. Either way, it also reduces noise a bit.
That said, along highways (especially near urban areas), they're usually much taller, with the roadside having a barrier. A cross section:
homes - mainwalk - bike path - hedge - barrier - road.
Re: @dan1101@lemmy.world , I'd also like to mention that some hedges can be pretty low-maintenance. Here are some that are especially for roads.
Top illustration is what I'm thinking of.
Hedges are also safer than concrete curbs in most cases as they don't crack your skull open when you land on them in an accident and if someone drives their car into them they function like a cushion. Plus trees give shade in summer which is nice for everyone for several reasons.
Trees and hedges are mostly safer than concrete and (as someone else pointed out already) can be implemented in a way that does not interfere with visual perception of traffic. Also trees provide shade during summer which is also nice.
And they need maintenance
You have to completely tear up the road for those usually, and that takes more time and money. They might have needed to do something similar for these, but it almost looks like they're placed there. The guy at the end did say they're looking into planters at least.
That also goes for installing curbs. I'd argue it's worth doing so, since these hedges also provide a little shade and noise reduction that curbs don't.