Previously: RR 6, with no changes or adjustments.

Concurrent with: ON 8. "408" was an internal designation used to refer to the portion of the highway in Stoney Creek (i.e., the pre-1974 village) covered by municipal maintenance. It was never signed this way in the field.

Succeeded by: RR 8 (King Street portion).

Previously: RR 11. Follows Concession Line 7.

Adjustments: In the late 1990s, the portion of Mud Street near RR 411's historical terminus was realigned to interface with the Lincoln M. Alexander Parkway, leaving behind a stub named Old Mud. It's unknown whether the "411" designation was actually applied to the new road.

This highway's designation reverted to RR 11 on some late-period signage.

Previously: RR 12, with no changes or adjustments.

Added in 1979. This road was newly-constructed.

Adjustments: By 1984, RR 416 had been extended east along Paramount Drive to Mud Street.

Previously: RR 24. Truncated slightly from that road's original incarnation. Follows Concession Line 2.

Previously: RR 25 (west of Tapleytown Rd.), RR 25A. Follows Concession Line 4.

Added in 1979; probably unnumbered before.

This highway's designation was shortened to RR 30 on some late-period signage.

Previously: RR 25.

Previously: RR 45. Street name also given as Gray Rd; no consistency.

Added in 1979; probably unnumbered before (though the "Fifty Road" name suggests otherwise). A very short segment abutting ON 8 was previously part of RR 24.

Added in 1979; probably unnumbered before. The road's terminus at the QEW seems odd, given the lack of a connection.

Added in 1979; probably unnumbered before.

Added in 1979; probably unnumbered before. Another regional road whose number terminates at the QEW without a connection.