Most of our gate motor content assumes a single leaf: one sliding gate on one track, or one swing leaf on one pillar, driven by one motor. That covers the majority of suburban Pretoria driveways, but wide tandem driveways — double-width entrances built for two cars side by side, or properties with a long, wide frontage — often need a different configuration entirely: a bi-parting gate, where two leaves open away from each other from a central meeting point, each on its own motor. This is a genuinely different design problem from choosing between a single sliding or swing gate, and it's worth understanding before you're quoted on one.
Why Not Just Use One Wide Leaf?
Technically you can push a single-leaf gate quite wide, but there are real practical limits. A single sliding leaf wide enough to span a double driveway needs a very long straight run of track to slide into when open, which not every property has space for along the boundary wall. A single swing leaf that wide becomes extremely heavy and places enormous leverage strain on its hinge pillar and motor, well beyond what our gate motor sizing guide would recommend for a standard single-motor installation — length adds leverage independent of weight, and a very long single leaf multiplies that effect. Splitting the opening into two leaves, each roughly half the width, keeps each leaf's weight and length within a normal single-motor duty class, and often fits the available space far better than one very long leaf needing a long slide-back run or a wide swing arc.
Sliding vs Swing Bi-Parting Configurations
Bi-parting gates come in both sliding and swing form. A bi-parting sliding gate has two leaves that each retract sideways in opposite directions along their own track, meeting in the middle when closed — this is the more common configuration for wide tandem driveways, since it needs no swing clearance in front of or behind the gate. A bi-parting swing gate is simply the standard double swing-leaf configuration already common on many suburban driveways, covered from a single-vs-double perspective in our sliding vs swing comparison — what makes it a true bi-parting system in the technical sense discussed here is that both leaves are driven and synchronised as a matched pair rather than simply two independently-timed motors that happen to open at roughly the same time.
How Motor Synchronisation Works
The defining technical feature of a bi-parting installation is synchronisation between the two motors, and this is where it differs most from simply installing two separate single-gate motors side by side. Bi-parting kits use a matched pair from the same manufacturer, wired together and configured as a master and slave unit: the master motor's control board manages the timing sequence for both leaves, ensuring they open and close together rather than one leaf lagging behind or reaching its end position before the other. This matters both for a clean, even appearance and for safety — two leaves closing at noticeably different speeds increase the risk of one leaf being mid-travel while the safety beam has already cleared for the other.
Why the Leaves Overlap at the Centre
Looking closely at a closed bi-parting gate, the two leaves rarely meet perfectly edge to edge — one is usually staggered slightly in front of or behind the other at the centre point. This is a deliberate design choice, not a misalignment. A small overlap means that if the two motors' timing drifts even slightly out of sync over time, from wear, minor voltage differences, or a slightly different mechanical load on each side, the leaves brush past each other's overlap zone rather than colliding edge-on. It also closes the potential security gap at the centre more effectively than two leaves that only just touch, since a flush meeting point that's even a few millimetres out becomes a visible gap, while a staggered overlap tolerates that same drift without ever opening a real gap.
Cost and Maintenance Implications
Running two motors instead of one roughly doubles several ongoing considerations, and it's worth budgeting for this rather than being surprised by it later. Two motors, two gearboxes, two sets of limit switches and two sets of tracks or hinges each need independent servicing, which our maintenance checklist effectively needs to be applied twice per visit rather than once. Backup power sizing also needs to account for both motors drawing from the same battery bank during a cycle, which is worth discussing against our backup power comparison when planning load shedding resilience for a bi-parting installation specifically, since the combined draw is higher than a single-motor system of the same overall gate width.
| Factor | Single-leaf gate | Bi-parting double-leaf gate |
|---|---|---|
| Best suited to | Standard single-width driveways | Wide double/tandem driveways |
| Motors required | One | Two, matched master/slave pair |
| Brand flexibility | Any compatible single motor | Must be same brand and model pair |
| Servicing effort | One motor, gearbox, track/hinge set | Effectively double, on both sides |
| Backup power draw | Single-motor load | Combined dual-motor load per cycle |
When a Single Wide Leaf Still Makes Sense
Bi-parting isn't automatically the right answer for every wide driveway. Where there's ample straight track run available along the boundary for a sliding gate, or where budget genuinely only stretches to one motor, a single wider leaf sized correctly against the duty-class table in our sizing guide can still be the more practical and considerably cheaper option. Bi-parting earns its extra cost and complexity specifically where space, leaf weight, or leverage genuinely rule out a single leaf — not simply because the driveway happens to be wide.
Frequently Asked Questions
What is a bi-parting gate?
A gate with two leaves that open away from each other from a central point, each on its own motor, commonly used on wide double or tandem driveways.
Do both motors on a bi-parting gate need to be the same brand and model?
Yes — synchronisation relies on a matched master/slave pair from the same manufacturer sharing the same control logic and timing protocol.
Why do bi-parting gate leaves overlap slightly instead of meeting edge to edge?
A staggered overlap prevents collision if motor timing drifts slightly out of sync, and it closes the centre security gap more reliably than a flush meeting point.
Is a bi-parting gate more expensive to install and maintain than a single-leaf gate?
Generally yes — two motors, two track or hinge sets and synchronisation electronics cost more upfront, and servicing effectively doubles.
For a genuinely wide tandem driveway, a bi-parting gate is often the more practical solution than forcing a single oversized leaf to do the job — but it's a different installation with different costs, so it's worth understanding the trade-off before comparing quotes.