When a car accelerates gradually (no squealing tires), is the friction between tires and road kinetic or static? When a car accelerates gradually (no squealing tires), is the friction between tires and road kinetic or static?

kinetic friction.

Explanation:

We know that generally friction are two types

1) Static friction - When body is in rest condition. The applied force on the body is balanced by static friction force. To move the body we have applied force more than maximum value of static friction.

2) Kinetic friction - When body is moving.

Here given that car is moving that is why the friction force will be kinetic fiction.

Therefore the answer will be kinetic friction.