. . . of the axle weight is proportional to damage inflicted on the road surface.
In the early 90s, when I was working in Trinity College Dublin, we took the 3rd year students on a 2 night field trip down the country. Available car-owning adults would pile 3-4 students into cars and we'd roar along country lanes visiting breweries, mushroom factories, plant-breeding centres and stud farms. Anything and anywhere that could spell genetics. Nobody died, although drink was taken when offered. None of the drivers looked at the small print of their insurance to see whether it covered carrying passengers during the course of work. One year the Professor of Human Genetics had a vital funding meeting in The Office and said he'd catch up with us later. We arrived at our final destination after dark and sloped off the pub. The Prof didn't catch up until almost closing time. Travelling at speed in the gloaming he had struck a pot-hole that bent his wheel out of shape and he couldn't manage more than 50km/h all the way back to town at the end of the field trip.
The Grape [bloboprevs] with its fancy alloy wheels, was particularly delicate w.r.t. potholes and the tires cost 3x more than those attached to my 'umble little Yaris.
Brainstorm episodes pop up on the RTE front page. The headline people came up with Where will the cash come from to fix the latest crop of Irish potholes? for a wide ranging pothole rabbithole by Paul "Strategic Procurement and Supply Management" Davis of DCU. It's not just about the money, although obvs fixing this perennial political football is. It's topical because Storm Chandra [26/27 Jan 26] whacked out A Lot of minor roads across Leinster and €60m is required for ASAP fixing.I like Paul Davis's ironic style ". . . a reminder that drainage, sub‑base saturation and deferred maintenance are not abstract concepts. They are what you feel through the steering wheel at 30 km/h while hoping your tyre survives the morning"
My 4th Power headline riffs on a linked rhetorical 8min piece to mic from April 2025 could we tax 'supersized' cars to fix potholes? We currently road-tax private cars by CO2 emissions [in g/km] from €120 - €2,400 a year. €120 for eVs as if they have zero emissions - although we have carbon belching power-stations contributing to the ESB grid. where almost all of the >100MW stations are burning Kinsale gas. The state also cuts wheeled megaGas guzzlers some slack by making every car over 225g/km pay 'only' €2,400. Buses tractors hearses & trucks pay at a different [much lower rate] rate.
HGVs are a problem wrt potholes which I've Blobbed before as doing [4th power effect] up to 60,000x as much damage as our humble Yaris.You know this: he crappiest road surfaces are often quite local and associated with the farmsteads with biggest sheds [and by implication the biggest tractors]. I have two good pals who, through no fault of their own, were born in continental NW Europe. Every time, I go driving with them, they tsk tsk as we rattle over a road covered in mud and shite and say that where they came from, farmers are obliged to clean their lumpy detritus off the public road.
Paul Davis gives some interesting insider info about potholes and water. Surface water maximises the power of passing wheels to carry way bit of the road. You know this: potholes blossom on sharp inside corners unless scrupulous attention is paid to prevent puddles where all tires cut the corner. That sort of drainage can often be maintained with a shovel and was before we started railing against the state to make everything better because we pay taxes.
But schlubbstrukture [= water in the sub-base] is more damaging and harder to fix. When the sub-base is saturated, tires striking even a minor deformity at the surface propagate a shock wave through the foundation that can eventually lead to a sinkhole [Waterwolf prev]. It is waaay easier and cheaper to fix roads pro-actively on schedule in the Summer. Taxing by axle-weight is clearly too frightening a nettle to grasp not least because eVs [the current chimaera for making everything better] are designed with an enormous heavy Li-battery aboard. It's not easy to sort out these competing desiderata, but sending a gang of council workers out in scut-truck half filled with tarmac and shovels should not be part of the solution.
Because we love each other very much MeFi had a Pothole thread over the w/e.






