This may or may not have any significance but I audited the gully grates in my road.
I live in a Cul-de-sac.
There are 3 grates used in the road.
The larger grate that damaged my wheel.
Then there are 2 smaller grates (45 x 45cm).
One has safety splits and the other is completely open.
However there are a couple things to note:
The width of grate’s opening is 4 cm – this makes it more difficult for the wheel to jam in the grate, there’s more leeway for tipping the angle of the wheel before it might damage the rim.
Also to note is the grates are angled at a diagonal of 45 degrees - this makes it more unlikely that your front wheel will drop into the grate.
My Cul-de-sac joins what I would call a longer connecting road, basically the same as the Cul-de-sac in width but has a higher level of traffic by its nature. All of the gully gates are smaller and feature the safety splits. This is also true of the main roads near me – it is only in the Cul-de-sac where I come across this larger more hazardous type of grate.