The Celerio is a decent city car, but it was designed as an inexpensive small car so refinement is never going to be its strong suit and you will have to accept a degree of road noise.

However, there are some things you can look at. One option would be to swap the tyres for alternatives that have a low noise rating. If you visit blackcircles.com and enter your registration number or tyre size, you can view a number of suitable tyres for your car. If you can find a tyre with a noise rating of under 70dB then you should find this reduces the amount of road noise coming through to the cabin.

Another option would be to have sound deadening material fitted to your car. Depending on how far you want to go, you could have this fitted behind the door cards and under the carpets, offering increased insulation from exterior noises. This is something you could potentially try yourself, or a good car audio specialist will be able to supply and fit this for you.