Relativity

Here's something to think about.

You're driving down the motorway, London to Bristol on the M4. You see a sign saying "Bristol 70 miles". You are travelling at 70 mph, so you are one hour away.

In a little while the traffic gets heavier and you slow down to 30 mph. Then you see a sign saying "Bristol 30 miles". You are travelling at 30 mph, so you are one hour away.

Have you actually got any closer?