I-97 and all its 3DI's at it Zenith in Planning circa 1982
See below for more information
By 1982 I-97 and I-197 were approved from the BATCS and the US-50/301 studies. The I-297 is proposed at this point to follow MD-3 from Bowie to Millersville.

Mileages are as follows:
I-97 33.62 miles
I-197 4 miles
I-297 7.7 miles




Sources:
1. Mileages are from maps and EIS's
2. Above map from EIS#  FHWA-MD-EIS-81-01-f