Traditional dial-a-ride services, such as call buses, call-line-taxis and call collective taxis, already play an important role in public transport.
They help provide mobility where regular fixed-line services are difficult to operate, especially in rural areas, during off-peak hours or in places with low and changing demand.
Many of these services are familiar to passengers and already integrated into local public transport structures. However, the way they are operated can become a challenge.
If bookings, dispatching and reporting still rely heavily on manual processes, even a well-established service can become difficult to manage and scale.
Digitising an existing service does not mean replacing it with a completely new transport model. It means keeping the familiar structure of lines, stops and timetables, while making the service easier to book, operate and evaluate.
This becomes especially useful when existing processes start to make the service harder to manage or improve.
1. Bookings still depend mainly on phone calls
Phone booking remains important, especially for passengers who are less comfortable with digital tools.
However, when most bookings are handled by phone, every request, change, or cancellation creates additional manual work. This can put pressure on call centers, dispatch teams, and transport operators.
A digital booking option can simplify the process, while phone booking can remain available for those who need it.
2. Dispatching requires much coordination
These services often require many small operational decisions in the background.
Which trips have been booked? Which stops need to be served and in which order? Which vehicle should be assigned? Can several passengers be combined within the same time window?
When these steps are handled manually, operations become more complex, especially when several lines or service areas need to be coordinated.
Digital systems can automatically connect bookings, timetables, stops, and vehicle routing in one workflow, while algorithms help optimise dispatching and routes.
3. Service data is difficult to evaluate
A service can only be improved if operators and authorities understand how it is actually used.
Which lines are booked most often? Which time windows have low demand? Which stops are rarely served? Where do empty kilometres occur?
If this information is stored across different systems, manual reports, or paper-based trip records, it becomes difficult to evaluate the service properly. Receipts and service documentation also add administrative effort when they are handled separately instead of being available in one central overview.
Digitisation creates better visibility and transparency over rides, utilisation, and demand patterns. This helps operators and authorities make informed decisions to improve service efficiency, while role-based and tenant-specific access rights keep information clearly separated.
4. Vehicles are not being used as efficiently as they could be
In low-demand areas, every vehicle and every driver hour matters.
Existing dial-a-ride services can help avoid running fixed routes without passengers. However, when bookings and routes are coordinated manually, it can still be difficult to combine several trips, assign vehicles efficiently, or decide which stops should be served.
This can lead to unnecessary vehicle kilometres, empty runs, or several vehicles being used where one could potentially cover the demand.
With digital line-based DRT, vehicles can follow a defined line or timetable structure but only operate when bookings exist.
Depending on the service design, stops can be mandatory, optional or restricted. In periods of low demand, one vehicle can also serve several lines. This can lead to better vehicle utilisation and improve cost efficiency.
5. The service is becoming harder to scale
Many call bus, call-line-taxi or call collective taxi services work well at a small scale.
But as demand grows, manual processes can become a bottleneck. More bookings mean more calls, more coordination, more driver communication and more administrative work.
A digital platform can support this growth without requiring a full replacement of the operating model.
From traditional call taxi to digital line-based DRT
The goal is not to make every service fully flexible.
In many regions, the most practical solution is a middle ground: structured enough to remain understandable and cost-efficient, but flexible enough to respond to actual demand.
Digital line-based DRT offers this approach by bringing traditional dial-a-ride services into a digital operating environment.
Passengers still see familiar stops, lines, and departure times. Behind the scenes, vehicles are deployed according to bookings, routes can be adapted, and operations can be managed more transparently.
This makes digital line-based DRT especially relevant for existing call bus, call-line-taxi and call collective taxi services.
A traditional dial-a-ride service does not need to be replaced to become more efficient.
Sometimes, the next step is to digitise what already works.