Thank you both for your replies. I am now thinking that the appropriate concrete mix will be best. However, OH points out that the tarmac lane outside our house has horses on it every day and has stood up to the strain for years with no ill effects.
He's quite right. So I now I don't know what to do.
Comments??
Depends I guess what you want to do on the surface. If you want to swill out stables for example then concrete is probably better. If you are only use it to get to the stables then it will be like an extension to your drive and tarmac would be OK.
I agree in very hot weather horses will make prints in it so if you want to tie them up on it then it could be a problem but it will depend on how much sun it gets.
Modern tarmac is terribly slippery for horses. And as Buttermilk pointed out not the usual surface for a yard. Over time I suspect good concrete lasts longer than tarmac and there could be a price difference?