[This comment is now included under the image in question]
The little table about cars and trucks compares the crossover speed above which tyre noise surpasses drivetrain noise.
Graph:
Car noise sources, ICE drivetrain with a notchy transmission.
Meaning:
The constant traffic roar in the suburbs will continue, because at dual carriageway speed, eliminating drivetrain noise has minuscule effect on total noise.
[This comment is now included under the image in question]
The little table about cars and trucks compares the crossover speed above which tyre noise surpasses drivetrain noise.
Graph:
Car noise sources, ICE drivetrain with a notchy transmission.
Meaning:
The constant traffic roar in the suburbs will continue, because at dual carriageway speed, eliminating drivetrain noise has minuscule effect on total noise.
Thank you!