Just has a worrying thought..

Tell me if im talking rubbish here, but the sleeping policeman i have round my way are the rectangle type (normally three beside each other) spanning across the road,that allow busses to drive through them without the wheels touching. (im not able to post a picture sorry)
but unless you are mindful we could be causing serious issues to wheels and suspension parts, let me try and explain.

when we attempt to go through this particular type of traffic calming, we either try to span them in the hope our wheel base will clear them, but unfortunately it doesn’t and this looks like it not only puts stress on the inside of each rim, but also the suspension and tyre sidewalls too, do you think there is less stress driving one side up over the ramp and the other through the gap, or allow the inside of the rims to take the stress of a three ton motor, hence some inferior rims cracking and sometimes completely breaking away, and premature suspension wear.

your thoughts..

I tend to straddle them (wheels either side) but I run 19s with deeper sidewalls so less concerned about rim stresses. I'd be surprised if the rims of larger wheels with shallower sidewalls were at risk though - the profile of the calming humps is quite gentle so unless one were to be driving like a spotty youth I'd say you'd be fine.

Taking the "one side over the hump" approach might require some slowing down (which is the whole idea of course) but even at 25-30mph I'd have thought the on/off angles are gentle enough not to cause the suspension any real worries. If in doubt, drop a few mph off the speed.

It's the 4 inch deep, sharp edged potholes that would concern me on shallow sidewall tyres. I once a bent a rim on one of these on a previous car - a 17 inch rim with 45 profile tyre on a 1 tonne car. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Don't get me wrong I'm all for the traffic calming as its outside a toddler school, but you can imagine every time I go out I have to drive over two sets of these.
Up till now it's not caused me a problem, but given the RRS history on bushes etc, I thought I would chew some fat..

go with both wheels over it at the same time.
less stress on the ARB bushes.

don't worry about the rimms

it is an offroader and during offroading it gets a lot more stress on rimms and suspension.

^^
Just to provide a bit of balance .... I disagree with all of the above.

I live in the same area as the OP and we have a particularly swivel-eyed loony left wing local authority. These speed humps are massive and shaped like the keys on a computer with sharp edges not a rounded surface in sight.

If possible do anything to avoid them altogether but if unavoidable then straddle them or drive over at very low speed.

The humps will defininitely crack your rims if you take them at anything other than a crawl. The internet is bursting with confirmation this is true.

Yes the RRS is an off road vehicle but the suspension was never designed to take the shock loading caused by these ridiculous obstructions.

The greatest irritation of all is that Hertfordshire has the most appallingly neglected roads of any county in the country there are so many bumps, potholes and worn out fretted surfaces they are a danger to all road users. Yet the local Highways department still sees fit to spend our money on erecting more and more dangerous obstructions and chicanes. When will this madness end? 2008 MY Java Black TDV8 HSE

Is this a joke???

Have a look on youtube what our cars are capable of and then re-access if this is really a "problem", I know they can be a bit temperamental at times but seriously, a speed bump causing a problem to a range rover............has the world gone mad?

we have similar bumps round my way, and i straddle them and have had no issues, had full tracking done a year or so before having it rechecked and a year of driving over them multiple times a day had not made anything out of line and my wheels are still round

Speed bumps do no damage to your car - FACT

Drivers do the damage to the car when driving at the wrong speed or to aggressively over them Mike

2014 Facelift Discovery

If you have relatively low profile tyres (<55 profile) it is best NOT to straddle, it puts stress on the inner sidewalls which can cause premature failure at high speed.

Obviously the odd occasion does not do much damage but many people run on regular routes so come across. I this is typical of your daily drive I'd advise you allow one side to ride the hump straight on and if you think its a good idea to alternate which side but don't get too paranoid.

This is relevant to Range Rovers etc. because of their weight and very relevant to performance cars because their tyres have extremely flexible i.e. thin) side walls which will easily bruise.