8.3km east of J17 ­ Church Lane bridge near Swallett Gate and Sodom

3.1km east of J17 ­ Seagry Road bridge between Upper Seagry and Sutton Benger

8.4km west of J16 ­ bridge between Grittenham and Brinkworth

3km east of J16 ­ Mill Lane bridge

At J15 ­ bridge between Badbury and Liddington

6.9km east of J15 ­ bridge at Peaks Down north of Aldbourne

1.8km west of J15 ­ Broome Manor Lane bridge to Hodson