Of horse and province

Coming up with my own rules for a hexcrawl campaign and trying to simplify movement across hexes.

Detailed map: 1 hex is roughly 10 kilometers, or 6 miles - roughly!

Horses
Walk: 1 hex per hour
Canter: 2 hexes per hour
Gallop: 5 hexes per hour

Humans
Walk: 1 hex per 2 hours
Run: 1 hex per hour

A human who walks, or a horse that canters, must make a check at the end of every day or else suffers from exhaustion.
A human who runs, or a horse that gallops, must make a check at the end of every hour or else suffers from exhaustion.

Travel time multiplier for
Roads x1
Desert x2
Forest x2
Hills x1.5
Plains x1.5
Jungle x4
Mountain x3 (x2 with proper climbing gear, for everyone)
Swamp x3
Tundra x2.5

Examples: A human walking on a map through
Roads = 1 hex per 2 hours
Hills, Plains = 1 hex per 3 hours
Desert, Forest, Mountain (equipped) = 1 hex per 4 hours
Tundra = 1 hex per 5 hours
Mountain (unequipped), Swamp = 1 hex per 6 hours
Jungle = 1 hex per 8 hours

Speed isn't affected by encumbrance, but exhaustion checks suffer a penalty for being encumbered.
I'm thinking encumbrance will be a static amount modified by strength, carrying more than that is "being encumbered" and carrying twice the limit its impossible to move.
Very simple, very easy. I like simple and easy.