Sissi Wang, Jennifer Wong, Song Yang

Target users include: Users who crowd entrances Frequent commuters who commute during rush hour

3 major user needs identied: Speed ability to board trains fast

Time between when user settles on the platform and boards the train

Comfort comfortable experience while waiting for subway trains Minimum distance between user and others

Accessibility ease of movement from one location to another Time to get from one location on the platform to another Amount of clearance available on the platform

Category #1: Physical barriers Examples:

- Stanchions - Fences

Features - Vertical obstacle that prevents people from entering/exiting areas

Benets: - Portable - Easy to set up/remove - Enclosed area can be modied

easily Shortcomings:

- Easily knocked over - Possibility of people climbing

over

Category #2: Signage and announcements Examples:

- Signs - Floor graphics - PA systems

Features: - Directs people to platforms

through public displays/announcements

Benets: - Can be used for other safety

messages Shortcomings:

- Ineective; no direct inuence on physical behaviour of users

Category #3: Active Denial Systems Examples:

- Sonic Screen The Mosquito

- Heat ray Features:

- Emits heat or a sound with high frequency

Benets: - Large aected area - Small size

Shortcomings: - Expensive - May be harmful - Fixed systems are not

portable and dicult to adjust settings

Category #4: Law enforcement equipment Examples:

- Batons - Pepper spray

Features: - Deters people from

remaining/entering areas through pain or discomfort

Category #4: Law enforcement equipment

Benets: - Eective

Shortcomings: - Harmful to people - Requires personnel to operate

equipment

Product category Speed Comfort Accessibility Success in marketplace

Physical barriers Medium

Medium Medium Most widely used product

Signage and announcements

Bad Bad Bad Widely used product

Active denial systems

Bad Good Good Not widely used product

Law enforcement equipment

Bad

Bad

Good Not widely used product

Scale: Good, medium, bad Rated according to metrics provided in 3rd slide

Active denial systems and law enforcement equipment may be modied for target users.

New requirements: Ease of setup/removal

Time taken to setup/remove product Portability

Volume in implemented state Weight

Flexible conguration