| Country: | ZAF |
| Route: | 78 |
| Direction A: | North |
| Direction B: | South |
| Terminus A: | near Modderfontein |
| Junction: | in Sebenza, Edenvale in Edenglen, Edenvale in Klopper Park, Germiston |
| Terminus B: | in Klopper Park, Germiston |
| Type: | JM |
| Length Km: | 6.1 |
| Maint: | Johannesburg Roads Agency and Gauteng Department of Roads and Transport |
| Next Type: | JM |
| Previous Type: | JM |
| Previous Route: | 77 |
| Next Route: | 79 |
The M78 is a short metropolitan route in Greater Johannesburg, South Africa.[1] [2] It is a short route connecting Illiondale with Klopper Park in the Edenvale/Germiston area of Ekurhuleni Metropolitan Municipality.[3]
The M78 begins at a junction with the R25 road in the suburb of Illiondale (south of Modderfontein and north-east of Edenvale CBD). It begins by going southwards through Illiondale to reach a junction with the M59 road (Terrace Road). It continues south as Harris Avenue, separating the Sebenza and Edenglen suburbs of Edenvale, to reach a junction with the M16 road (Baker Road) east of Edenvale CBD. The M16 joins the M78 and they are one road southwards for a few metres before the M16 becomes its own road eastwards (Harris Avenue) while the M78 remains as the southerly road (Shelton Road).
The M78 proceeds to fly over the R24 highway (Albertina Sisulu Freeway) and enter Klopper Park (the northernmost suburb of Germiston), where it reaches a junction with the M99 road (Herman Street). It proceeds south-east through Klopper Park to reach its end at another junction with the M59 road (Lazarus Mawela Road).