Traffic light sequence quiz of the day...

[TVR1]

A question that I often ask pupils.

Why do traffic lights sequence

Red
Red/Amber
Green

Green
Amber
Red

Why not?

Red
Red/Amber
Green

Green
Green/Amber
Red

I fully expect the answer in 1 post from us on PH but you’d be surprised how many of the general public don’t know the answer.

[caiss4]

Because a solid amber light means stop so combining with a green light would be contradictory.

Close thread

[TVR1]

caiss4 said:

Because a solid amber light means stop so combining with a green light would be contradictory.

Close thread

No, solid amber means prepare to stop (if safe)

Why not Green/Amber go but prepare to stop?

What’s the idea behind the sequencing though?

You loooooooose!!!

Edited by TVR1 on Saturday 28th December 16:21

Edited by TVR1 on Saturday 28th December 16:22

[Dr Jekyll]

caiss4 said:

Because a solid amber light means stop so combining with a green light would be contradictory.

Close thread

But equally combining red and amber is tautologous.

Perhaps it's to let you know where you are in the sequence.

[321boost]

TVR1 said:

No, solid amber means prepare to stop (if safe)

Why not Green/Amber go but prepare to stop?

What’s the idea behind the sequencing though?

You loooooooose!!!

Edited by TVR1 on Saturday 28th December 16:21

Edited by TVR1 on Saturday 28th December 16:22

Red means stop and wait behind white line.
Red and amber mean stop and do not proceed until green shows.
Green means keep going if your way is clear.
Amber after green means stop but only proceed if already past the white line or too close to it.

Green and amber would mean proceed if your way is clear and also stop if you’re not close enough to the line or past it (I.e does not make sense when Amber serves this purpose of stopping if you’re not close enough to the line).
If you’re further away from the line then green and amber would basically mean go and stop.

Edited by 321boost on Saturday 28th December 16:41

[majordad]

In Ireland we don’t have the amber before Green you have, we keep a beady eye on the other sides green and go when it goes red. It’s called anticipation.

I’m maddened when cars in front don’t pull smartly away on green, many seem to hang about waiting for a particular shade of green.

[BertBert]

Amber means stop. It's an offence to go through amber.

[Chester draws]

It's so that if both the red bulb, and the green bulb have failed, drivers can still tell where the lights are in the sequence.

[TVR1]

Chester draws said:

It's so that if both the red bulb, and the green bulb have failed, drivers can still tell where the lights are in the sequence.

And expect to stop.

Winner WINNER! Chicken dinner!!!

[Keoparakolo]

TVR1 said:

Chester draws said:

It's so that if both the red bulb, and the green bulb have failed, drivers can still tell where the lights are in the sequence.

And expect to stop.

Winner WINNER! Chicken dinner!!!

Eh? If both red and green bulbs have failed then all you’d see is an occasional amber with no idea what’s supposed to come next.

[Fermit and Sexy Sarah]

Keoparakolo said:

Eh? If both red and green bulbs have failed then all you’d see is an occasional amber with no idea what’s supposed to come next.

Only green follows amber.

[321boost]

Keoparakolo said:

Eh? If both red and green bulbs have failed then all you’d see is an occasional amber with no idea what’s supposed to come next.

[TVR1]

321boost said:

Keoparakolo said:

Eh? If both red and green bulbs have failed then all you’d see is an occasional amber with no idea what’s supposed to come next.

Think about it keo....

Edited by TVR1 on Saturday 28th December 17:19

Edited by TVR1 on Saturday 28th December 17:21

[Alucidnation]

I have found that if all the lamps fail, traffic flows much smoother.

[TVR1]

Fermit and Sexy Sarah said:

Keoparakolo said:

Eh? If both red and green bulbs have failed then all you’d see is an occasional amber with no idea what’s supposed to come next.

Only green follows amber.

There’s only one thing that follows amber....

[Alucidnation]

TVR1 said:

Fermit and Sexy Sarah said:

Keoparakolo said:

Eh? If both red and green bulbs have failed then all you’d see is an occasional amber with no idea what’s supposed to come next.

Only green follows amber.

There’s only one thing that follows amber....

Eh?

[WonkeyDonkey]

I dont get this either.

Most lights I see go red, red&amber, green

Then green amber red.

So if both red and green bulbs had blown how would you know which order it was going in?

[Drumroll]

Dr Jekyll said:

But equally combining red and amber is tautologous.

Just love the use of "big words" Really screams look at me I can use words that the rest of you are unlikely to understand. Even if it's use in this context is questionable.

[Pica-Pica]

TVR1 said:

caiss4 said:

Because a solid amber light means stop so combining with a green light would be contradictory.

Close thread

No, solid amber means prepare to stop (if safe)

Why not Green/Amber go but prepare to stop?

What’s the idea behind the sequencing though?

You loooooooose!!!

Edited by TVR1 on Saturday 28th December 16:21

Edited by TVR1 on Saturday 28th December 16:22

Do you not teach your pupils that green also means prepare to stop? Dear, Dear.

[thecremeegg]

WonkeyDonkey said:

I dont get this either.

Most lights I see go red, red&amber, green

Then green amber red.

So if both red and green bulbs had blown how would you know which order it was going in?

Yea you're right, all the ones round us have amber both sequences....