Google argues that driverless cars improve highway safety while enabling lower federal spending on roads, buses, and trains. The government should support driverless cars because they will allow it to spend less on roads, public transport, and parking, Google will tell US law makers on Tuesday. A month after Google recorded its first own-fault accident in a self-driving car, Chris Urmson, head of the project at Google, will urge senators to allow the US Department of Transport to clear a path for the vehicles because they're safer and will ultimately cost the government less. Exactly what impact driverless cars will have on roads is still being debated. Some believe they will cut congestion due to the potential for car-sharing.