System Architecture and Wire Frames

Riders Taxis & Vans Trains & Buses Information System implemented in the cloud Drivers Operators Civilians

Rider/Drive r Major Modules Cloud Google Maps Personal Data Routing Data Phone Interfaces Browser Interface Drivers and Riders use a common interface that can run on either a phone (iPhone, Android, SMS) or a browser (Firefox, Explorer, Chrome). We can start with just a browser, usable on smart phones. Requests for service and profile modification are recorded in the personal data base which is kept synchronized between the interface device and the cloud. Matches are performed in the Routing Data module which uses Google Maps for basic services but maintains a large graph of all trips planned or requested. Google Maps is also used to create presentations for the interfaces. Italics designates outsourced modules. Not all connections are shown. Billing System SMS Service Mail Service Trip Manager Traffic Monitor

BoE Data Requirements Each user requires a negligible amount of data, easily held on a smart phone: contact information, current co- ordinates, social network, preferences, current plans, past trips The Routing Data base might be big. – For every existing street segment or planned traverse of a street segment, 10 3 bytes – Manhattan has over 125 cross streets and 12 avenues, so it has over 2*125*12 = 3,000 street segments – Suppose 10% of our N customers have 20-block trips in the data base at any time. 2*N planned segment traverses. – 10 3 *(3000+2*N) = 3* *10 3 *N = 3* *10 6 *(N/10 3 ) = 3 + 2*n MB for n thousand users. – For 1 million users, about 2GB—still not much.

BoE Processing Requirements We’d like instantaneous response for active users, but network delays will probably dominate, so programming convenience is probably the more important consideration. Dedicate a virtual processor to each one. Suppose.01% of 10 6 users are active at a time. Requires 100 processes = 100 Heroku Dynos and 100 Heroku Workers. About $6,000 per month.

Start time: (now) Date: (today) End place: Start place: (here) Return start time:* Repeat* Daily MTWTF Weekly Ride Offer

Start time: (now) Date: (today) End place: Start place: (here) Return start time:* Repeat* Daily MTWTF Weekly Ride Request Request Offer: $

Xxx: (preset) Xxx: (preset) Xxx: (preset) Xxx Title Xxx XXX

Date: Time: Start: End: Name: * Cell: * * Send My Ride Request for You My Name My cell Yes Maybe Message No

Name: Birthday:* Cell Phone: Profile (X) Use for real-time communication I would drive* if it took less than Gender* (10) extra minutes. I would charge the rider $ (1.00) plus $ (0.00) per mile I would ride* if it took less than (10) extra minutes. I would pay the driver $ (1.00) plus $ (0.00) per mile Female Male Prefer Female Riders Male Riders Prefer Female Drivers Male Drivers Submit Password: Set Billing Information