Sounds exactly like an electric streetcar. A Tesla semi visited the Tesla office in Draper, UT earlier this month. : teslamotors
Thanks. That sounds really awesome. I look forwards to the Tesla semi because it means these things will get up, and move. Being behind one won't feel like I'm trapped.
I dig the sound. I bet that is a nearly empty trailer. Its not likely to accelerate like that loaded.
To me, most of the noise on the Tesla Semi sounded like tire noise, not from the transmission or electric motors.