from the start of july 2018 works have been taking place to upgrade a part of the m23 to an all-lane-running motorway. this is between junction 8, with the m25 and junction 10 with the a264. it is due to be finished by spring 2020 with a budget of £164 million. the upgrades are taking place mostly for more reliable journeys to gatwick airport. the upgrades include an all-lane-running motorway, 12 new emergency areas, a new concrete central barrier replacing the current steel one, new roadside sound barriers, variable speed limits and two new emergency access slip roads.