Many of the UK's police forces have confirmed exactly how far over the speed limit drivers can go without them being slapped with a penalty.
The general belief is that you can go '10 per cent + 2' over the limit without that dreaded letter arriving in the post.
That means on a 30mph road, a camera wouldn’t normally activate unless a car drove past at 35mph or faster, reports Chronicle Live.
On a motorway - where the speed limit is 70mph - you would have to go 79mph before getting fined.
While it appears that theory isn't inaccurate you should be wary as not all areas are the same - and it seems things are a little more relaxed in some areas.
London and Lancashire, for example, both employe a '10 per cent + 3' threshold.
Many wonder why there is any tolerance allowed, especially on dangerous roads with vehicles travelling at high speeds.
The reason given is that there is wiggle room so drivers aren't looking down at their speedometers - but are keeping their eyes on the road up ahead, avoiding collisions.
Some forces declined the chance to take part in the study, but many explained all.
But don't assume the same level of tolerance exists where it hasn't been confirmed or revealed.
The allowances are all at the discretion of the police - so needless to say it's always better for everyone just to stick to the limit.
Car insurers Confused.com said that when 45 UK police forces were contacted, 33 responded, and of those 25 shared information about when their speed cameras activate if a driver is going above the speed limit.
Here are the replies of the 33 forces that responded:
- Avon and Somerset 10% + 2mph
- Bedfordshire Wouldn't reveal threshold
- Cambridgeshire Wouldn't reveal threshold
- Cheshire 10% + 2mph
- Cleveland 10% + 2mph
- Derbyshire 10% + 2mph
- Devon and Cornwall 10% + 2mph
- Durham 10% + 2mph
- Essex Don't use a standard threshold
- Greater Manchester Wouldn't reveal threshold
- Gwent 10% + 2mph
- Hampshire 10% + 2mph
- Hertfordshire Wouldn't reveal threshold
- Kent 10% + 2mph
- Lancashire 10% + 3mph
- Leicestershire 10% + 2mph
- Merseyside 10% + 2mph
- Metropolitan Police / TfL 10% + 3mph
- Norfolk 10% + 2mph
- North Wales 10% + 2mph
- Northumbria 10% + 2mph
- Nottinghamshire Wouldn't confirm if threshold exists
- Northern Ireland 10% + 2mph
- Scotland Wouldn't confirm if threshold exists
- South Wales 10% + 2mph
- South Yorkshire 10% + 2mph
- Staffordshire Wouldn't reveal threshold
- Suffolk 10% + 2mph
- Thames Valley 10% + 2mph
- Warwickshire 10% + 2mph
- West Mercia 10% + 2mph
- West Midlands Wouldn't reveal threshold
- West Yorkshire 10% + 2mph
In 2017, the rules on speeding fines changed.
They are now based on a percentage of your weekly income, with the minimum fine being £100. This is in addition to getting points on your licence.
The Government says the current minimum fine for speeding is £100, plus three penalty points.
You also risk disqualification if you amass 12 or more penalty points within three years. Evo says the average speeding fine in 2015 was £188 with over 150,000 people caught in the UK - with fines rising by 50 per cent the average fine could increase to £282.
