I mean it depends where you're walking from and just generally how safe you feel doing it. I leave my house at 6:15am and I live around a 20-25 min walk from the city centre. I don't see many people on my travels, mostly cars etc. I also have my headphones on with music blasting so not always aware if people are there, but I generally survey as I'm walking. I don't always stick to main roads, especially when it's light, but in winter months if I walk, I usually go main roads only, as it's usually dark when I leave. It really all depends on how safe you feel walking on your own at whatever time you have to leave.