combined level crossing flashing lights and traffic lights

[onestrangeday]

Hi PJW:

thanks your reply. I guess probably different countries have different approach. Since I'm not experienced in combined installation for signals, what are the main consideration and things need to pay attention to the combined installation ?

It'd be good to see this photo; I really can't think of one in the UK. Even where there is a level crossing very close to a crossroads wich necessitates interlocking between the road traffic lights and the crossing I do not visualise the "wig-wags" on the same post as the traffic lights.

I can't find anything in the book itself which you mention..

1. Certainly it could easily confuse a driver to be presented by a green traffic light and flashing red wig-wags. Let's hope they do obey the latter. Really can't understand what circumstances would make this a sensible arrangement. Note that in the UK a police officer has the authority to give permission for a driver to pass a red traffic light, but NOT flashing red wig-wags (because these are used to protect AHBC and this could be a very dangerous thing to do)

2. I'd certainly hope that anyone who decided to produce such an arrangement would have submitted to a Human Factor's Assessment.

Anyone else aware of such installations- I guess not in the UK but elsewhere......

Hi Signalling Engineer:

Recently, I am just reading the "introduction to railway signalling" book the part that describing the level crossing and I remembered I have seen the photo of combined flashing lights and traffic lights on the same post that someone has showed me before. Since I am not familiar with combined installation, I have questions such as

1. is the driver be more likely to obey the flashing lights or the traffic lights (personally, I think the driver would be more likely to obey the flashing light since it 'flashes' and attract the driver attention) I'm not sure whether I am right for this ?

2. is there any human factors behind this ? and how can a signal design engineer take this into the level crossing design ?





thanks