If a high hill stood between A and B, it was important to decide whether the line should climb over it, pierce it with a tunnel, or make a detour to avoid it

She lost her job because of her careless remark

Here I decide, without hesitating, to take the alternative route

Researchers announce method of circumventing Windows Vista security features

They were carelessly unaware of the danger

It was careless of you to lose my car key

It was careless of you to leave the key in your car

It was careless of me to do something like that

I missed it inadvertently

In other words, the merits, etc. of making detours are the consideration of the attitudes of the landowners whose property the line would cross, the convenience of other towns and villages, as well as connection with other railway lines