Sometimes getting from A to B on the UK's motorway network is fairly straight forward.
If luck is on your side, and you travel at a time of day when others bare in bed or sat at their desks, you can rattle along the M1 with ease.
The arrival of smart motorways with variable speed limits means traffic can be controlled and, hopefully, congestion avoided.
Now it's been suggested that the top motorway speed limit of 70mph could potentially be increased, because of the rise of electric vehicles.
It's previously been suggested that increasing the limit to 80mph would generate an extra 2.2 million tonnes of CO2 a year.
But with electric cars now a genuine option for motorists looking at their next set of wheels that argument appears to no longer carry much weight.
During the recent Conservative Party conference transport minister Grant Shapps said: "I've been thinking about this issue and maybe even sought advice on the subject of late.
"I think there is an argument for looking at our speed limits, both in terms of higher speed limits and actually lower limits - 20mph outside of schools.
"When it was last looked at in 2011, reviewing the last submission to ministers on the subject, it was thought the carbon emission addition would be too great.
"But since I am a driver of an electric car myself I got to thinking about whether that would still be the case.
"I think there is an argument that once you have increased the level of electrification and therefore decreased or entirely removed carbon, that you might look at those things again."
Registrations of fully electric vehicles were up from 880 in July 2018 to 2,271 in July 2019, according to the Society of Motor Manufacturers and Traders (SMMT).
They still only account for 1% of all new vehicles registered in the UK.
You can buy a new electric vehicle for around £20k.
A recent report commissioned by the Department for Transport found that increasing the speed limit from 40 to 50mph for heavy goods vehicles has saved businesses millions of pounds and freed up thousands of driving hours.
The chief executive of Highways England, Jim O’Sullivan, said: “Parts of the network could already operate with an 80mph limit, but such a move was being held back by public opinion.”
RAC head of roads policy, Nicholas Lyes says any increase in motorway speed limits is “fundamentally an issue of safety”, not a case of balancing emissions.”
He added: “Unless there is compelling evidence that a change in the limit on some stretches of road would not adversely affect safety, the current limit should be retained."
