EXIT TABS:
Notice that the exit tabs on overhead gantry signs vary from state to state. In Oregon, the exit tabs are centred on top of the sign with a large to medium gap in between the exit tab and the main body of the sign. The most common types of exit tabs are shown below in the New Mexico example. They are offset on top of the gantry sign with little to no gap in between. They get placed on the right side of the sign for right exits (Example: I-40 West to Louisiana Boulevard) and on the left side of the sign for left exits (Example: I-81 South to I-66 East). However, in Washington state, the exit tabs are integrated into the main body of the sign. It is separated from all of the other information by a white line, and the text is always centred on the sign.

The same idea applies to road side navigation signs:

Please note that these are only general guidelines, and that there are some exceptions out there, but for the most part, the signs follow these guidelines. However, I would advise SCS should stick to using the general guidelines.
SPEED LIMITS:
All of the speed limit signs in Washington contain the word "LIMIT." On roads with a speed limit of 65 MPH+, they use the same "TRUCKS 60" plaque that Oregon uses. The truck speed limit throughout Washington it 60 MPH.

STATE ROUTE SHIELD:
Washington's state route shield is George Washington's head (George Washington was the first US president). Just like the US route shield and most other state route shields, it get placed on green navigation signs with no black border. It only gets a black border when it is used as a standalone sign.
