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Decoding the I-405 test toll signs
My morning commute takes me down I-405 in Seattle from the SR522 interchange to the SR520 interchange. I have a lot of time to stare at the new I-405 HOT lane signs. After seeing a wide range of test toll codes I’m confident in the following mapping:
| Symbol | Value |
|---|---|
| s | $ |
| c | . |
| h | 0 |
| n | 1 |
| d | 2 |
| r | 3 |
| l | 4 |
| t | 5 |
| g | 7 |
Here’s all the toll values you’ll see from $0.75 (minimum toll) up to $2.75:
| Code | Cost |
|---|---|
| shcgt | $0.75 |
| sdchh | $2.00 |
| sdcdt | $2.25 |
| sdcth | $2.50 |
| sdcgt | $2.75 |
| slchh | $4.00 |
| slcdt | $4.25 |
| slcth | $4.50 |
| slcgt | $4.75 |
Edit: changed “l” from 1 to 3 based on a tip from @WSDOTGoodToGo. Now I need to figure out what letter is a 1.
Edit: @WSDOTGoodToGo confirmed “l” is a 4.
Edit: After dealing with construction traffic on a Saturday night I’m fairly confident n < r < l. Since L is 4 and the only missing numbers were 1 and 3, that makes n == 1 and r == 3.