Is riding your bike in polluted air worse than not riding at all? A writer rides Amtrak rather than renting an office. And the woman behind the voice of Siri.

Labor Day Special: Amtrak as an office, Siri, crazy car colors, biking in bad air

Susan Carpenter and Alonzo Bodden host KPCC&#39;s weekly series on modern mobility. Cars, bicycles, trains, buses, motorbikes. If you can ride in it, or on it, we&#39;re talking about it.

Automotive

Susan Carpenter and Alonzo Bodden host KPCC's weekly series on modern mobility. Cars, bicycles, trains, buses, motorbikes. If you can ride in it, or on it, we're talking about it.

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Labor Day Special: Amtrak as an office, Siri, crazy car colors, biking in bad air

Labor Day Special: Amtrak as an office, Siri, crazy car colors, biking in bad air