Tires and/or wheels may be out of balance
Your car needs an alignment. Typically around $100 or less.
Higher g's produced at higher speeds are harder to survive.
Parts tend to loosen up in the car, and like anything else when cruising at fast speeds it intensifies the motion, hence the vibration.
Because at higher speeds you have more velocity than at lower speeds transferring more energy to make a bigger crashing causing more damage.
Are you car wheels all balanced properly? If not, an out of balance wheel can start to vibrate at certain speeds.
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Sound speeds up when the temperature rises because the molecules in the medium vibrate faster due to the increase in thermal energy. This results in a higher velocity of sound waves through the medium.
A tire not properly balanced. ------------------------------------ Are you car wheels all balanced properly? If not, an out of balance wheel can start to vibrate at certain speeds.
Cars vibrate.
cv axle The rear brake drums may be out of round also.
Could be wheel balance.