Scrub Hub: What's the future of bike lanes in Indianapolis? London Gibson, Indianapolis Star Replay Video UP NEXT Bringing with it sunshine, flowers and — finally — days above 65 degrees, May is one of the best months for getting outside in Indiana. It's also National Bike Month, so if you've been considering trading in your four wheels for two, now's the time to do it. Biking is one of the most environmentally friendly modes of transportation, requiring little resources and allowing for travel without emitting greenhouse gases. It's also one of the healthiest modes of transportation, both physically and mentally. But in order for people to feel safe biking in large cities, it's essential to have the infrastructure to support them, said Kim Irwin, executive director of walkability advocacy organization Health by Design.