8 Section 28A(1) is not an easy provision to understand in its application to cases where a subdivisional road joins an existing road.
9 There are two difficulties. The first is in s 28A(1)(b). That paragraph refers to the original subdivider having subdivided land "that also has a common boundary with that existing road". However in cases where a subdivisional road joins an existing road the land of the later subdivision may not have a common boundary with the existing road. In those circumstances the word "also" in s 28A(1)(b) could be redundant or it could mean that even where the claim is made in relation to a subdivisional joining an existing road a lot or lots of the later subdivision must have a common boundary with that existing road for the subsection to apply.
10 The second difficulty relates to the part of the existing road for which the earlier subdivider can recover one half of the cost. It is clearly not the whole of the existing road, it is "the part of the existing road ..... which is joined by a subdivisional road". However where the subdivisional road extends an existing road the part which is joined is only the line at which the subdivisional road joins the existing road.
11 The only reported decision on s 28A of which I am aware is Trlin v Fabio (1994) 12 SR (WA) 19. That case differed from this case in that the later subdividers' lots had a common boundary with the existing road and the claim was one under s 28A(1)(a)(i). In Trlin v Fabio Commissioner Millar held that the later subdivider was liable to contribute to the cost of not only the part of the road with which the later subdivider's lots shared a common boundary, but also "some 10 m extending from the boundary of [the later subdivider's land with the existing road] to meet the Shire obligation to take new roads into existing roads."
12 Commissioner Millar apportioned the later subdivider's liability to contribute to that cost according to the relative proportions of each subdivider's frontages onto the existing road.
13 I find it difficult to see how s 28A provides an apportionment of other than one half. I also find it difficult to see how in a case such as Trlin v Fabio the subdivider's obligation is to the cost of a greater part of the road than the part which has a common boundary with the later subdivider's lot or lots. However as this case comes within s 28A(1)(a)(ii) I do not think that Trlin v Fabio can assist in the determination of it and I express no further view on that case.
14 It is necessary to refer to the history of the legislation. Prior to the Town Planning and Development Amendment Act 1986 s 28A(1) of the Act provided.