According to the BS and BRE guides (on which the building regulations are based), there is no mention of highways, just the potential impact on foundations - and even then it is stated as "not normally" and not "not ever".Soakaways should be at least 5m from the foundations of a house or a road according to building regulations.
Subject to suitable design, design capacity and local ground conditions, a soakaway could go much nearer to a house.