| Underpass | Road | Crosses under |
|---|
| Adam Underpass | Slip road connecting PIE to Lornie Highway | Lornie Road |
| Anak Bukit Underpass | Jalan Anak Bukit | Jalan Jurong Kechil |
| Ang Mo Kio Underpass | Ang Mo Kio Avenue 3, Hougang Avenue 2 | Yio Chu Kang Road |
| Braddell Underpass | Braddell Road | Central Expressway (CTE), Braddell Flyover |
| Bukit Timah Underpass | Bukit Timah Road | Adam Road, Farrer Road, Farrer Flyover |
| Clementi Avenue 6 Underpass | Clementi Avenue 6 | Commonwealth Avenue West |
| Dunearn Underpass | Dunearn Road | Adam Road, Farrer Road, Farrer Flyover |
| Farrer Underpass | Farrer Road, Queensway | Holland Road, Holland Flyover |
| Lornie Underpass | Lornie Road | Lornie Highway |
| Nicoll Underpass | Slip road connecting Sims Way and KPE to Nicoll Highway | Sims Way, Nicoll Highway |
| Queensway Underpass | Queensway | Commonwealth Avenue |
| Rifle Range Underpass | Slip road connecting PIE to Jalan Anak Bukit | Pan Island Expressway (PIE) |
| Sime Underpass | Lornie Road, Kheam Hock Road | Lornie Highway |
| T4 Underpass | T4 Underpass | Airport Boulevard, T4 Boulevard |
| Tuas Underpass | Pan Island Expressway (PIE) | Jalan Ahmad Ibrahim, Ayer Rajah Expressway (AYE), Tuas Road, Tuas Flyover |
| Tuas West Underpass | Ayer Rajah Expressway (AYE) | Tuas West Road |
| Upper Paya Lebar Underpass | Upper Paya Lebar Road | Bartley Road, Bartley Road East, Bartley Viaduct |
| Woodleigh Underpass | Bartley Road, Braddell Road | Upper Serangoon Road, Serangoon Viaduct |