In everyday experiences within our familiar environment, the effects of time dilation and length contraction are not directly noticeable. They become significant only when we approach speeds close to the speed of light or when exposed to intense gravitational fields.
Time dilation refers to the slowing down of time for an object or observer relative to another object or observer. For example, a person traveling at a significant fraction of the speed of light would experience time passing more slowly compared to a stationary observer. However, these effects are not perceivable in day-to-day experiences or even in typical vehicular travel where speeds are much lower.
Similarly, length contraction, also known as Lorentz contraction, is the phenomenon where an object appears shorter in the direction of its motion as it approaches relativistic speeds. However, this contraction is not noticeable at the speeds we encounter in our daily lives.
To truly perceive and measure these relativistic effects, extremely high speeds or intense gravitational fields are required, which are not encountered during ordinary travel in a vehicle.
However, it's worth mentioning that certain technological devices, such as GPS satellites, need to account for both time dilation and length contraction due to their high speeds relative to observers on Earth. These effects must be considered for accurate measurements and precise calculations in these specific cases.