Here's the question we're trying to answer:

"I spend a lot of time in slow traffic, driving to and from work. My manual Ford Focus is a great car, but it's quite tiring in this situation. I know a lot of cars have come on the market recently that have radar-controlled 'traffic jam assist' or similar adaptive cruise control systems. I wonder if you can recommend one for me? I have up to £30,000 to spend." Tom

The brief:

A family car that's not too large; Automatic gearbox; Petrol or hybrid; Less than £30,000; Adaptive cruise control

Let's take a look at the new-car choices: