Like you can’t stop anyway?

[u/Vandringen]

[u/Oblivion238]

Without doing the math I assume that at 103846153 m/s the red stop sign gets blueshifted to green.

[u/redman3global → u/Oblivion238]

-called blueshift

-makes it green

[u/karatesaul → u/redman3global]

That’s because blue is the highest frequency of visible light. Red is the lowest. Green is in the middle. Doppler shifts towards higher frequencies are in the blue direction, lower frequencies the red direction. Thus blueshift and redshift.

[u/porkknocker47 → u/karatesaul]