London ‘robocab’ cap sparks awkward question: Why can TfL limit autonomous Wayve and Uber PHVs but not the rest?
- Perry Richardson
- 42 minutes ago
- 3 min read
Transport for London’s (TfL) decision to approve a maximum of 15 autonomous private hire vehicles for a supervised one-year trial has prompted fresh questions across the taxi industry about how such a limit has been imposed under existing private hire legislation.
For more than a decade, taxi drivers, trade groups and even TfL itself have argued that licensing authorities have no legal power to restrict the number of conventional private hire vehicles entering the market.
Successive governments have also maintained that any cap would require primary legislation and should not be introduced under the current legal framework.
Yet the approval granted to Uber and Wayve appears to do exactly what campaigners have repeatedly been told is impossible. Rather than issuing licences to every qualifying vehicle, TfL has authorised a supervised pilot involving up to 15 vehicles for a fixed period of one year.
That distinction has not gone unnoticed by London’s taxi trade. For years, drivers have pointed to the rapid expansion of London’s private hire fleet as a major contributor to falling earnings, increased congestion and longer waiting times between jobs. During that period, the consistent response from regulators has been that licensing authorities are legally obliged to issue licences where applicants satisfy the statutory requirements, leaving no scope for numerical limits.
TfL has itself repeatedly argued for changes to legislation. The regulator has previously stated that it does not have the power to cap or restrict private hire vehicle numbers and has called on Government to grant those powers alongside reforms to cross-border hiring rules. The Mayor has also previously said primary legislation would be needed before such a system could operate effectively.
Recent analysis explained that licensing authorities in England currently have no legal mechanism to refuse private hire vehicle licences simply because an area is considered oversupplied, despite increasing concern around congestion and driver incomes. It also noted that any meaningful cap would require changes to legislation, particularly around cross-border hiring, to prevent drivers simply licensing elsewhere and continuing to work in the same market.
The autonomous vehicle trial now introduces an interesting legal and regulatory question. Is the 15-vehicle ceiling simply a condition attached to a time-limited trial involving a single operator, or has TfL demonstrated that it already possesses a mechanism to limit vehicle numbers under certain circumstances?
If the restriction is based on the trial approval rather than on general vehicle licensing powers, TfL may argue that no wider precedent has been created. However, if regulators can legally authorise only a specified number of autonomous private hire vehicles, some within the taxi industry are likely to ask why similar discretion has never been available when licensing conventional fleets.
That question becomes even more relevant given the London Assembly Transport Committee’s recent calls for greater oversight of autonomous passenger services. The Committee has already indicated that passenger safeguarding and regulatory controls remain central concerns before any fully autonomous operation is permitted.
The debate is also likely to extend beyond autonomous technology. For years, campaigners seeking caps on private hire numbers have frequently been told that market forces should determine fleet size rather than regulatory intervention. The free market argument has been central to Government policy, despite repeated requests from TfL and industry representatives for licensing authorities to receive powers to manage supply.
Whether the robocab pilot represents an exceptional regulatory arrangement or the first example of TfL successfully limiting the size of a private hire fleet remains to be answered. Either way, calls for a trial PHV fleet cap on vehicles are likely to follow given the new power exercised in PHV regulation.
