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Functional requirement for a traffic light system?

I need some help listing some functional and non functional requirements for a set of traffics lights to be installed on busy crossroad

Any suggestion would be appreciated

Functional:
it shall detect the presence of traffic waiting at a red light
it shall respond to the presence of traffic waiting and change the signal to green
it shall light red lamps for ’stop’, green lamps for ‘go’, and amber lamps for ‘caution’.
It shall illuminate the amber lamps for xxx seconds before changing to red.
It shall illuminate the green lamps for xxx seconds before changing to amber.
It shall operate at temperatures from -40 degrees to +120 degrees.
etc.
etc.

Non functional.
The orientation of the lamps shall conform to all applicable standards and laws.
The lightbulbs may be incandescant or LED lamps.
The color of the control box may be silver or gray or black. etc.
The posts used to hold up the overhead lamps may be steel or aluminum, or wood with metal overhangs, etc.

etc.

.

This entry was posted on Saturday, January 16th, 2010 at 3:01 pm and is filed under traffic lights system. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

One Response to “Functional requirement for a traffic light system?”

  1. Functional:
    it shall detect the presence of traffic waiting at a red light
    it shall respond to the presence of traffic waiting and change the signal to green
    it shall light red lamps for ’stop’, green lamps for ‘go’, and amber lamps for ‘caution’.
    It shall illuminate the amber lamps for xxx seconds before changing to red.
    It shall illuminate the green lamps for xxx seconds before changing to amber.
    It shall operate at temperatures from -40 degrees to +120 degrees.
    etc.
    etc.

    Non functional.
    The orientation of the lamps shall conform to all applicable standards and laws.
    The lightbulbs may be incandescant or LED lamps.
    The color of the control box may be silver or gray or black. etc.
    The posts used to hold up the overhead lamps may be steel or aluminum, or wood with metal overhangs, etc.

    etc.

    .
    References :

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