Location: SH-1 and Main St, Ada After the 377/99 split as 1 joins, we’ll approach SH-3W and SH-19. Location: SH-1 and Main St, Ada Exit for 3W west and 19. This is the eastern terminus of both highways. SH-3E ends here as well, as 3E and 3W recombine to form SH-3. SH-1 stays with the … Continue reading Oklahoma State Highway 3E, US-377/OK-1/OK-99 to OK-1/OK-3/OK-3W/OK-19