TX US 281 new interchanges

[neroute2]

First off, EncRio does not have any of its own ramps, and is merely reached via the frontage roads from other interchanges, so it should probably be deleted. The same is almost true for RedRd, but the southbound exit for SonBlvd comes down before the RedRd intersection, so it is signed for both. However, the two will probably get the same exit number if exits are numbered, so RedRd could be deleted.

Now for new interchanges:
MarRd
BulRd
BorDr

[yakra]

First off, EncRio does not have any of its own ramps, and is merely reached via the frontage roads from other interchanges, so it should probably be deleted.

BALEETED!

The same is almost true for RedRd, but the southbound exit for SonBlvd comes down before the RedRd intersection, so it is signed for both.

OT1H, 1PPI.
OTOH, double partial interchanges @ > 0.5 mi.

However, the two will probably get the same exit number if exits are numbered, so RedRd could be deleted.

Deleted.

Now for new interchanges:
MarRd
BulRd
BorDr

Added.

https://github.com/TravelMapping/HighwayData/pull/6827