Estimate
An estimate is a modeled price range, not a carrier's offer. It should say it is an estimate and show the date of the inputs. It is not a booking, and it is not a single fare a carrier has accepted.
An estimate is a calculated range. It can use distance, a fuel price, and, once they exist, accepted shipments on similar lanes. It is not a company agreeing to move your car. A quote is that agreement to try. Mixing the two words is how a planning number gets treated as a promise.
How a range should be labeled
The page should say the figure is not a quote, name the date of the inputs, and say that the company you hire sets the price. A single dollar figure with no date and no range is not an estimate you can use. If the page does not say how many shipments or quotes sit behind a number, read sample size before you treat that number as the market.
RideShipper's calculator shows a price range before it asks for contact details. The range is for planning. It is not a booking, and it does not mean a carrier has accepted the load. You can have the estimate emailed without requesting quotes. A written quote from a company you have checked is the offer you can accept.