[Anechoic]

Another 2,000 would be a rounding error.

2,000 would be 2%. That's in the range of a traffic change (1% - 5%) that would degrade the Level of Service of a highway from D (design goal) to E or F.

It doesn't take much of a reduction in traffic to significantly improve free-flow. Or, conversely, it doesn't take much an increase in numbers to make traffic suck more than it already does.