Car insurance is more expensive in London than anywhere else in the UK.
On average, drivers in the capital pay over £1,200 each year to insure their vehicles.
London has also seen the steepest rise in insurance prices over the past 12 months.
From today, motorists in the boroughs of Westminster and Islington who leave their engines idling could be fined. Traffic marshals will be able to hand out £20 fines to drivers who leave the engine running while stuck in traffic.
The policy aims to cut air pollution, which London Mayor Boris Johnson claims is linked to the deaths of thousands of Londoners each year. Traffic marshals will firstly ask drivers to switch their engines off, with fines issued as a last resort.
A poll has found that only 15% of Londoners have got rid of their tax discs since they became redundant - among the lowest rates in the country.
The AA/Populus survey of almost 20,000 drivers found that only two in ten drivers nationwide had ditched the disc, with 43% of them leaving it as a reminder when the tax was due.
Almost on in ten respondents had not removed it because the car would "look odd" without it, with Londoners most likely to think this.
The emergence of electronic checks led to the scrapping of the vehicle excise duty car tax disc last October.
A leading road safety group says 55-thousand London motorists have points on their licence for using mobile phones.
The charity Brake is launching a campaign to get London drivers not to use their phones behind the wheel.
The Prime Minister is hoping to make motorway service stations reduce how much they charge for fuel.
Many around London charge as much as 10-pence a litre more than local garages.
One idea is to display a price comparison on road signs, so you can head to a cheaper petrol pump.
Mike Pearse has the details.