Roman Engelhardt

Technische Universität München | TUM · Chair of Traffic Engineering and Control

Autonomous on-demand mobility systems, especially ride-pooling services, except for providing convenient transportation for the people, could potentially improve the traffic congestion in urban environments by reducing the number of private vehicles. In this paper, we introduce an Autonomous On-Demand Ride-Pooling (AODRP) system, which uses a rathe...

With advances in digitization and automation, autonomous mobility on demand services have the potential to disrupt the future mobility system landscape. Ridepooling services in particular can both decrease land consumption by reducing the need for parking and increase transportation efficiency by increasing the average vehicle occupancy. Neverthele...

The market share of mobility on-demand (MoD) services strongly increased in recent years and is expected to rise even higher once vehicle automation is fully available. These services might reduce space consumption in cities as fewer parking spaces are required if private vehicle trips are replaced. If rides are shared additionally, occupancy relat...

This paper examines the integration of freight delivery into the passenger transport of an on-demand ride-pooling service. The goal of this research is to use existing passenger trips for logistics services and thus reduce additional vehicle kilometers for freight delivery and the total number of vehicles on the road network. This is achieved by me...

On-Demand Ride-Pooling services have the potential to increase traffic efficiency compared to private vehicle trips by decreasing parking space needed and increasing vehicle occupancy due to higher vehicle utilization and shared trips, respectively. Thereby, an operator controls a fleet of vehicles that serve requested trips on-demand while trips c...

This study investigates the implementation of semi-on-demand (SoD) hybrid-route services using Shared Autonomous Vehicles (SAVs) on existing transit lines. SoD services combine the cost efficiency of fixed-route buses with the flexibility of on-demand services. SAVs first serve all scheduled fixed-route stops, then drop off and pick up passengers i...

Rapid urbanization and growing urban populations worldwide present significant challenges for cities, including increased traffic congestion and air pollution. Effective strategies are needed to manage traffic volumes and reduce emissions. In practice, traditional traffic flow simulations are used to test those strategies. However, high computation...

This study addresses a large-scale multimodal transit network design problem, with Shared Autonomous Mobility Services (SAMS) as both transit feeders and an origin-to-destination mode. The framework captures spatial demand and modal characteristics, considers intermodal transfers and express services, determines transit infrastructure investment an...

This study addresses a large-scale multimodal transit network design problem, with Shared Autonomous Mobility Services (SAMS) as both transit feeders and an origin-to-destination mode. The framework captures spatial demand and modal characteristics, considers intermodal transfers and express services, determines transit infrastructure investment an...

Ride Parcel Pooling (RPP) is the integrated transportation of passengers and parcels. It builds on what's known as on-demand ride-pooling, which dynamically assigns customer trips to fleet vehicles in real time, sharing their rides, and thus aiming to save on driving distances and fleet size compared to on-demand ride-hailing services. In the case...

Mobility-on-Demand (MoD) services have been an active research topic in recent years. Many studies focused on developing control algorithms to supply efficient services. To cope with a large search space to solve the underlying vehicle routing problem, studies usually apply hard time-constraints on pick-up and drop-off while considering static netw...

Incidents disrupt the public transportation (PT) operation daily causing parts of the PT system to be temporarily out of service. The dispatchers in the operations control center (OCC) take multiple dispositive measures to resolve the incident and to mitigate its negative effects on the PT services. Usually, such measures are supply-centric readjus...

Incidents disrupt the public transportation (PT) operation daily causing parts of the PT system to be temporarily out of services. The dispatchers in the operations control center (OCC) take multiple dispositive measures to resolve the incident and to mitigate its negative effects on the PT services. Usually, such measures are supply-centric readju...

If private vehicle trips can be replaced, ride-pooling services can decrease parking space needed by higher vehicle utilization and increase traffic efficiency by increasing vehicle occupancy. Nevertheless, substantial benefits can only be achieved if a certain market penetration is passed to find enough shareable rides for pooling to take place. A...

This paper presents the goals of the German TEMPUS research project in and around the city of Munich and describes the test field that is being created as part of it. The project will test and evaluate the impact of connected and automated driving in urban and rural environments. For this purpose, a cross-area test field, which includes inner-city...

Electrification of vehicles as well as mobility-on-demand (MoD) services are two important trends these years. Hence, the supply of charging infrastructure (CI) becomes a necessity to ensure a smooth transition. While private vehicle owners expect a high availability of charging possibilities, the utilization of CI often suffers. Including charging...

This paper examines the integration of freight delivery into the passenger transport of an on-demand ride-pooling service. The goal of this research is to use existing passenger trips for logistics services and thus reduce additional vehicle kilometers for freight delivery and the total number of vehicles on the road network. This is achieved by me...

Autonomous mobility on demand services have the potential to disrupt the future mobility system landscape. Ridepooling services in particular can decrease land consumption and increase transportation efficiency by increasing the average vehicle occupancy. Nevertheless, because ridepooling services require a sufficient user base for pooling to take...

On-demand ride-pooling systems have gained a lot of attraction in the past years as they promise to reduce traffic and vehicle fleets compared to private vehicles. Transport simulations show that automation of vehicles and resulting fare reductions enable large-scale ride-pooling systems to have a high potential to drastically change urban transpor...

This paper deals with the idea of ride parcel pooling (RPP); an on-demand service, where passengers as well as parcels share-if possible-trips within the same vehicle. Potential users are surveyed to find criteria that are crucial for the success of an on-demand service. The survey looks at socio-demographic aspects and tries to assess the particip...

The ridepooling provider MOIA in Hamburg, Germany, currently operates the largest contiguous fleet in Europe. This study is part of the accompanying research to quantify current and future effects of the ridepooling service within the transportation system of Hamburg. With access to data of a large user survey and real operational data, a simulatio...

Ride- Parcel- Pooling expands conventional ride-pooling on-demand mobility services. It does not only offer passengers shared rides but also integrates parcels into the assignment problem to increase vehicle utilization during times of low passenger demand. This article examines the potential behind the combination of on-demand mobility and city lo...

Mobility-on-demand (MoD) systems, especially ride-hailing systems, have seen tremendous growth in recent years. These systems provide user-centric mobility services, whose users expect a high level of convenience. Waiting for a response after an app request and eventually learning after a long period of time that no vehicle is available is hardly a...

On-Demand Ride-Pooling services can provide a convenient mobility mode while decreasing vehicle kilometers in a transportation system. Nevertheless, the ultimate impact of such a service depends on a variety of different parameters and settings defining the service. In this study, a simulation framework is proposed which is designed to investigate...

Mobility-on-demand (MoD) systems, especially ride-hailing systems, have seen tremendous growth in recent years. These systems provide user-centric mobility services, whose users expect a high level of convenience. Waiting for a response after an app request and eventually learning after a long period of time that no vehicle is available is hardly a...

The goal of this paper is to develop a modeling framework that captures the inter-decision dynamics between mobility service providers (MSPs) and travelers that can be used to optimize and analyze policies/regulations related to MSPs. To meet this goal, the paper proposes a tri-level mathematical programming model with a public-sector decision make...

This paper presents the coupling of a state-of-the-art ride-pooling fleet simulation package with the mobiTopp travel demand modeling framework. The coupling of both models enables a detailed agent- and activity-based demand model, in which travelers have the option to use ride-pooling based on real-time offers of an optimized ride-pooling operatio...

The goal of this paper is to develop a modeling framework that captures the inter-decision dynamics between mobility service providers (MSPs) and travelers that can be used to optimize and analyze policies/regulations related to MSPs. To meet this goal, the paper proposes a tri-level mathematical programming model with a public-sector decision make...

With ongoing developments in digitalization and advances in the field of autonomous driving, on-demand ride pooling is a mobility service with the potential to disrupt the urban mobility market. Nevertheless, to apply this kind of service successfully efficient algorithms have to be implemented for effective fleet management to exploit the benefits...

On-demand ride-pooling (ODRP) services have the potential to improve traffic conditions in cities and at the same time offer user-centric mobility services. Recently, an analytical model, which investigates the influence of service quality parameters, such as detour, maximum waiting time, and boarding time, on the fraction of trips which could pote...

Whereas in some cities ropeways already belong to the transit system, in Germany they are better known from skiing in the alps or as tourist attractions that were implemented in relation to expositions as in Koblenz or Berlin. Nonetheless, a ropeway system has several advantages, which make it an interesting alternative in urban public transportati...

While in some cities ropeways already belong to the transit system, in Germany, they are rather known from skiing in the alps or as tourist attractions that were implemented in relation to expositions as in Koblenz or Berlin. Nonetheless, a ropeway system has several advantages, which make it an interesting alternative in urban public transportatio...