The idea im going for is a conservative approach. Only adding border controls where i need to and I will not add new locations if i feel other mods can do the job far better than i could. Some defenses like those in Whiterun Hold and The Reach are old and
well established, while others may have been hastily erected due to the
outbreak of the civil war and new threats to the hold.

A hold's military strength would have been taken into account in relation to how
unmanned or ill-equipped the post was. You may find fine fortifications
fully manned with mead and food supplies a plenty. Others may just be a
tent and a few stockades, a scouting post which is a deterrent to
attackers rather than a strategic stronghold.

Some borders would have been left unguarded all together if the holds were considered
allies or had enough resources nearby in towns to defend themselves. I
openly encourage the use of other mods to compliment my own. Such as;
Mods which increase the size of the smaller towns and add defenses to
them, mods which add roaming and more guards in general and mods which
add npcs to make the roads busier.

My Other SSE Mods
Goodfellow's Whiterun Hold - New discoveries, stores, npcs, detailing, towns.
Karthwasten - Let The Silver Flow -  Immersive silver economy
JUSTICE- City Exteriors - Adds signs that Skyrim's cities carry out justice
Elizabeths Tower - Azura Shrine - Makes the statue into a real landmark


Man THESE borders men!

Whiterun Crossroads Keep

An old keep crafted years past to control passage on the crossroads, in
the western reaches of Whiterun Hold. Located in a open area to scout
the open tundra, houses a small keep able to house guards and
provisions.

Whiterun Crossroads Outpost

Again, guarding the Western edge of the Whiterun Hold, a very hastily put
together set of woden barricades and outpost. Guards the road heading
through the hold to Falkreath and Hjalmarch. Forsworn who leak from The
Reach and travel on the road are swiftly dealt with. This outpost is
manned by the Crossroads Keep and it left unmanned overnight.

Pale Guard Outpost

A wooden outpost and guard patrol protects the road into the Pale, the
towering Whitewatch Tower is visible in the distance which does the same
task for Whiterun Hold.

Falkreath Hold Northern Gate

Constructed during the troubles within The Reach and the born of the Forsworn. A
wooden gate and lookout post watches over the hill to stop any
undesirables and to carry out checks on passing traders.

Lake llinalta Tower

An old, once abandoned Nord tower on the border of Falkreath and Whiterun
hold. Overlooks the lake and the road down to Riverwood and is now being
used as a fortification in the civil war to stop any Imperial activity
leaking into the Hold.

Rift Mountain Pass

Built many years ago to defend the mountain pass, has a large tower and
felled trees to maximize visibility. Guards have taken up home at a
nearby apparently abandoned Shack.

SunGuard Pass

An ancient structure built many years ago to control one of the routes
into the Reach. Left in ruin after a Forsworn raid took control of Fort
Sunguard and overwhelmed the guard from above.

Karth River Keep 

An ancient structure build many years ago to protect the hold from the
north. The raised platforms protect the paths to both Karthwasten and
Markarth. The keep itself serves as a resting place for both guards and
travelers.

Refugee's Rest Ruins (addition to vanilla assets)

During the refugee crisis from Morrowwind after the Red Mountain eruption, the
High King issued a decree to control the incoming horde and place them
in a camp on the border of Windhelm hold to allow holds to prepare for
the incoming demand on resources. Many Dunmer perished in the harsh
conditions and the cold winters, and the camp soon fell into disrepair
and was abandoned. The area is still used by refugees who have yet to
found a home within Skyrim.