Regardless of whether it is concrete wheel stops or the plastic recyclable ones there is an Australian standard by which the manufacturers and builders are supposed to abide by, unfortunately this sometimes doesn’t happen. There is a very good reason why they are supposed to be this height or lower and that is to prevent damage to the front of the car, if you have misjudged how far away you are from it. Most of the time with a slow approach you can feel the wheels resting up against the stops and there is no problem but if they are too high or you go over them too far then you are going to here that sickening scraping noise and have to reverse back and slowly move forward again.
If the car space is one where the car will be facing toward the kerb then the stop is supposed to be 620mm from the kerb and if the car is reversed parked into the space then the stop is supposed to be 900mm from the kerb, how this is meant to be policed is a mystery. People are prone to doing their own thing in cars and have no clue as to which space is meant to be what type of parking, so it is a case of they will park any old way they please. Though some states of Australia are in the habit of reverse parking everywhere, whilst others are forward wheel stops in Perth by parkerswa and thus these rules would apply to the relevant states. Which is why so many tourists have a hard time when they visit and travel throughout the country. Why there isn’t a generic rule for all states in road rules and traffic laws is another of those astounding mysteries, it is a fantastic way to revenue raise, grabbing all those visitors when they so something that is perfectly legal in their state but not legal in another. Slap a fine on them and happy holidays, come again real soon.
Here is a hint for those people coming to Queensland, avoid driving a car through Brisbane at all costs, if you want to visit the city then find somewhere where you can have long term parking and catch a bus or a taxi to your hotel and avoid all the stainless steel bollards of trying to find your way around. Even for those of us that live in the state or even close to the city, get lost and some are never seen again, forever circling in one way streets and bypasses that seem to lead back to exactly where you started. The navigational systems are not that helpful either, they mean to be but due to so many roads being so close together it can be deceptive as to where you are supposed to turn off. It is a nightmare of epic proportions, just catch a bus and ride through that way, get the scenic tour.