According to our current understanding of physics, it is not possible for any object with mass to travel at the speed of light. The theory of relativity, formulated by Albert Einstein, tells us that as an object with mass accelerates, its relativistic mass increases, and its energy requirements to continue accelerating become infinite as it approaches the speed of light. Therefore, it is not feasible for cars or any massive object to reach or exceed the speed of light.
The speed of light in a vacuum is approximately 299,792,458 meters per second (about 186,282 miles per second). This value is often denoted by the symbol 'c' in physics equations.
While it is not possible to reach or exceed the speed of light with current technology, various modes of transportation, such as rockets and spacecraft, can achieve significant velocities compared to conventional cars. For example, the fastest manned spacecraft to date, the Apollo 10 Command Module during its return from the Moon, reached speeds of approximately 39,896 kilometers per hour (24,791 miles per hour).
It's worth noting that even if we had hypothetically invented a method to travel at speeds close to the speed of light, it would have significant implications for our understanding of physics, time dilation, and the laws of the universe.