You want to cut them square then use a wacker to put some decent cold lay into them.
Or if your not too bothered about looks maybe a concrete dyed black would be cheaper.
Sand and cement £12.78
It will be the cheapest and it will last the shortest. A few weeks, whether ballast, sand or whatever. So a false economy.
A proper job will involve widening the hole, excavating out all the damp, soft, soggy, spongy, hardcore, reinstating hardcore and then if you are doing all this, might nas well do the tarmacing with a base and top coat and sealing the edges.
What about pinching a couple of those plastic sheets that the gas/electric/water companies use when digging up the roads and paths?
In reality, you can fill it with concrete or tarmac and that will form a surface. But the things which will determine how long it lasts is whether the base is firm and whether the area collects water - which then either degrades the repair or degrades the tacmac around the repair.
Whatever you do you need to cut it so it has a good thick edge on it.
How many vehicles/houses use the track?
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