15
Hubble Law:  Everyone sees same expansion
 40 miles
 20 miles
   0 miles
-70 miles
d  relative to B
140 miles
120 miles
100 miles
 30 miles
d
2 hr
2 hr
2 hr
2 hr
t0 = 1/H0
 20 miles/hr
 10 miles/hr
   0 miles/hr
-35 miles/hr
vr  relative to B
D
C
B
A
Car
t0 = 1/H0
vr
2 hr
70 mph
2 hr
60 mph
 ----
50 mph
2 hr
15 mph
You get the same result whether you use “absolute” velocities and distances, or measure velocities relative to any arbitrary car.
Every driver thinks they are at the center of the “car universe” and the other cars are just heading away from them, all having left at some common start time.  See http://www.astro.ucla.edu/~wright/nocenter.html
Car “B” is the Highway Patrol – using a radar gun which can find speed and distance to other cars – but can’t see the ground.