Priority in my Opinion
1 I-10 in Baton Rouge (Mississippi River Bridge to the I 10/12 split)
2 Extension of Interstate 49 from Shreveport to the Arkansas Border
3 I-20 in Monroe and Shreveport
4 Extend I-49 south of Lafayette to New Orleans
5 I-12 from Walker to Slidell
6 I-10 from Texas border to Lake Charles
7 I-10 in New Orleans (Williams Boulevard to Causeway Boulevard)
Most Realistic to Happen
1 Extension of Interstate 49 from Shreveport to the Arkansas Border
2 I-12 from Walker to Slidell
3 I-10 from Texas border to Lake Charles
4 I-20 in Monroe and Shreveport
5 I-10 in New Orleans (Williams Boulevard to Causeway Boulevard)
6 Extend I-49 south of Lafayette to New Orleans
7 I-10 in Baton Rouge (Mississippi River Bridge to the I 10/12 split)
I-49 North is almost finished (save for the Inner City Connector segment through downtown Shereveport); I-10 through Baton Rouge is simply a pipe dream since the Perkins Road neighborhoods oppose any widening of the existing route; and I-10 between LCH and the TX border is essentially finished save for the upgraded Calcasieu River bridge (and I-210 buys time there).
My list of priorities:
1) I-49 South from Lafayette to Morgan City (including I-49 Connector through Lafayette)
2) I-49 Inner City Connector in Shereveport
3) I-20 widening in Shreveport and Monroe
4) I-10 widening in Lafayette
5) South Bypass Loop OR LA 1/Sunshine Bridge/LA 70 Toll Bypass around BTR/Plaquemine/Donaldsonville
6) I-12 widening Satsuma to I-10/I-59 interchange in Slidell
7) I-49 South Raceland to I-310 segment w/ temp. tie-in to I-10 via I-310
8) Complete Westbank Expressway upgrade to US 90
9) I-10 widening I-310 to Causeway Blvd. (w/ directional connectors to NOLA Louie Armstrong International Airport from/to W I-10)