Make the best choice to get across town!
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TranspoChoices is all about making better transportation choices. However, our calculations are only approximations and should be treated as such.


You'll need an API key for Bing maps. Get one at, then set an environment variable in your .bashrc or .bash_profile like so:

export BING_KEY="your-bing-api-key"

Ruby 1.9.2 or greater is required to run this app. Install ruby, then:

gem install bundler
git clone
cd transpochoices
bundle install
bundle exec rackup

Open your web browser to localhost:9292

Continuous Integration

Build Status






	"units": {
		"distance": "kilometers",
		"duration": "seconds",
		"emissions": "milliliters of innocent bunny blood",
		"cost": "usd",
		"calories": "calories"
	"results": {
		"driving": {
			"distance": 15.943,
			"duration": 900
		"walking": null,
		"transit": {
			"duration": 2427,
			"while_walking": {
				"distance": 1.872,
				"duration": 1347
			"while_transit": {
				"duration": 1080


Deployment is easy on Heroku.

heroku create your-app-name
git push heroku master
heroku config:set BING_KEY=your-bing-key



Cost - Always rounding to $0

Time - Calculated by Bing Walking Routes API

Calories - Using this table, assuming a 160lb individual

CO2 Emissions - Always rounding to 0


Cost - $0.115 per mile

Time - Calculated by Bing Walking Routes API, then extrapolates biking time

Calories - Assuming 30km/h and 24 calories/km

CO2 Emissions - Always rounding to 0


Cost - Uses fare data in the GTFS specification (SF Muni and BART only)

Time - Calculated by Bing Transit Routes API

Calories - Calories burned while walking to transit, then 1.4-1.7 calories per idle minute

CO2 Emissions - 0.65 pounds of CO2 per passenger mile - assuming bus transit


Cost - Uses scraped taxi rates

Time - Calculated by Bing Driving Routes API

Calories - 1.4-1.7 calories per idle minute

CO2 Emissions - 0.96 pounds of CO2 per passenger mile - assuming single occupancy vehicle


Cost - Uses $0.585, the 2011 AAA average cost per mile

Time - Calculated by Bing Driving Routes API

Calories - 1.4-1.7 calories per idle minute

CO2 Emissions - 0.96 pounds of CO2 per passenger mile - assuming single occupancy vehicle

Who Made This?

TranspoChoices was lovingly made by Code for America fellows Aaron Ogle and Talin Salway, with design work by Pete Fecteau. Feel free to send feedback to aaron [at]

This is cool. Can I help?

Sure! TranspoChoices is an open-source project and we're looking for people with all kinds of talent to get involved.


In the spirit of free software, everyone is encouraged to help improve this project.

Here are some ways you can contribute:

  • by using alpha, beta, and prerelease versions
  • by reporting bugs
  • by suggesting new features
  • by writing or editing documentation
  • by writing specifications
  • by writing code (no patch is too small: fix typos, add comments, clean up inconsistent whitespace)
  • by refactoring code
  • by resolving issues
  • by reviewing patches

Submitting an Issue

We use the GitHub issue tracker to track bugs and features. Before submitting a bug report or feature request, check to make sure it hasn't already been submitted. You can indicate support for an existing issuse by voting it up. When submitting a bug report, please include a Gist that includes a stack trace and any details that may be necessary to reproduce the bug, including your gem version, Ruby version, and operating system. Ideally, a bug report should include a pull request with failing specs.

Submitting a Pull Request

  1. Fork the project.
  2. Create a topic branch.
  3. Implement your feature or bug fix.
  4. Add documentation for your feature or bug fix.
  5. Run bundle exec rake doc:yard. If your changes are not 100% documented, go back to step 4.
  6. Add specs for your feature or bug fix.
  7. Run bundle exec rake spec. If your changes are not 100% covered, go back to step 6.
  8. Commit and push your changes.
  9. Submit a pull request. Please do not include changes to the gemspec, version, or history file. (If you want to create your own version for some reason, please do so in a separate commit.)

Supported Rubies

This library aims to support and is tested against the following Ruby implementations:

  • Ruby 1.9.2
  • Ruby 1.9.3


Copyright (c) 2011 Code for America Laboratories See LICENSE for details.

Code for America Tracker

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Made by badgers at Code for America