How to measure road distance

hi,
I want to make roads using spline about 400 km long, So how can i measure the distance .

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The return is in Unreal Units, a.k.a. uus a.k.a. centimeters.

I want to make roads using spline
about 400 km long

Do note that Unreal maps can be like 10 km across, tops, and you’ll get floating point errors when going that far anyway. Unless you mean a super tight bendy road in that 5x5 km space.

Other than that, look into: