aChordate said:Homework Statement
A police officer pulls you over for running a red light. You tell the
officer, “But the light looked green to me!” How fast would you have to be traveling for
this statement to be true?
Homework Equations
?
The Attempt at a Solution
Can anyone point me in the right direction?
aChordate said:Homework Statement
A police officer pulls you over for running a red light. You tell the
officer, “But the light looked green to me!” How fast would you have to be traveling for
this statement to be true?
Homework Equations
?
The Attempt at a Solution
Can anyone point me in the right direction?
PeterO said:My understanding is that "red-shift" occurs when the light source is moving away from you (relatively speaking), but the motorist is clearly moving towards the light.
OmCheeto said:Quick! You still have time to delete your dyslexic post!
ps. I agreed with you at first, as I am totally dyslexic. But then I saw that Dick and CWatters had commented, and would have caught that in a second, so I double checked, and red light is the lower frequency, meaning lower energy. Ergo, going faster would shift the light to a higher frequency, and therefore to green.
As rude man says, you'd do better using the relativistic formula: http://en.wikipedia.org/wiki/Relativistic_Doppler_effect.aChordate said:5.863*10^14Hz=4.6*10^14Hz (1-vrel/c)
vrel=3.8%*10^8m/s
Is this correct?
The exact speed required to trigger a red light camera varies depending on the specific system and location. However, in general, most red light cameras are triggered when a vehicle passes through an intersection at a speed of at least 10 mph above the posted speed limit.
In most cases, running a red light is only considered a violation if the vehicle enters the intersection after the light has turned red. However, some jurisdictions may consider a vehicle to have run a red light if it enters the intersection just as the light is turning red, so it is important to always obey traffic signals and come to a complete stop before the light turns red.
Yes, you have the right to challenge a red light camera ticket. However, the process for challenging a ticket may vary depending on your location and the specific circumstances of the violation. It is important to carefully review the ticket and any evidence provided, and seek legal advice if necessary.
Studies have shown mixed results on the impact of red light cameras on accident rates. While some studies have found a decrease in the number of accidents at intersections with red light cameras, others have found no significant change or even an increase in accidents. The effectiveness of red light cameras may also depend on other factors, such as driver behavior and the specific design and placement of the cameras.
In most cases, turning right on red is allowed at intersections unless there is a sign indicating otherwise. However, you may still be ticketed for running a red light while turning right if you do not come to a complete stop before making the turn or if you turn from a lane that is not designated for right turns. It is important to always follow traffic signals and signs to avoid receiving a ticket.