Evacuation Route Selection Using Risk Maps
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Solution Overview
Problem
Existing emergency evacuation systems do not comprehensively evaluate the safety of potential evacuation destinations, leading to increased risks of collisions when vehicles are evacuated to locations with low visibility or high stopping risks.
Innovation Solution
An evacuation travelling assistance apparatus that acquires and analyzes map, vehicle, and environmental information to determine the safest evacuation destination and route by evaluating risks associated with stopping and passing through various locations, using a combination of sensors and risk maps to select a route with lower stopping and passing risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the vehicle is evacuated to the nearest road shoulder without evaluating safety conditions, then the evacuation response time is reduced, but the safety level of the evacuation destination decreases
Solution Approach 1:
The system performs preliminary evaluation of multiple potential evacuation destinations before the actual evacuation occurs. By pre-assessing safety conditions (visibility, road gradient, surface conditions) and risks (collisions, overshooting) for multiple locations, the system prepares safe evacuation options in advance, allowing quick execution without compromising safety.
Solution Approach 2:
The system changes the evaluation parameters dynamically based on vehicle state and environment. It adjusts the selection criteria by considering multiple factors (visibility, gradient, surface conditions, following vehicle distance) and their weights, transforming the simple nearest-destination selection into a multi-parameter optimization problem that balances speed and safety.
2Reliability
If the vehicle is evacuated to an evacuation destination with high safety level, then the safety level of evacuation destination is improved, but the travelling distance to reach the destination becomes excessively long
Solution Approach 1:
The system dynamically adjusts the evaluation parameters by considering multiple factors (visibility, gradient, surface conditions, following vehicle distance) and their weights. This transforms the simple nearest-destination selection into a multi-parameter optimization problem that balances safety and distance.
Solution Approach 2:
The system evaluates more parameters and more destinations than strictly necessary for basic evacuation. By comprehensively assessing multiple safety factors and multiple potential destinations, it identifies the optimal balance point that provides sufficient safety without excessive travelling distance.
3Reliability
If the vehicle travels a long distance to reach a safe evacuation destination, then the safety level of evacuation destination is improved, but the risk of accidents during the evacuation process increases
Solution Approach 1:
The system performs preliminary evaluation of multiple potential evacuation destinations before the actual evacuation occurs. By pre-assessing safety conditions and risks for multiple locations, it prepares safe evacuation options in advance, allowing quick execution without compromising safety.
Solution Approach 2:
The system continuously monitors the evacuation process and adjusts control based on real-time feedback. It compares the actual vehicle state and environmental conditions with the planned evacuation parameters, making corrections to maintain safety while minimizing accident risks during the evacuation manoeuvre.
4Reliability
If the system comprehensively evaluates multiple risk factors for evacuation destination selection, then the safety level of evacuation destination is improved, but the complexity of the evacuation system increases
Solution Approach 1:
The system segments the evacuation decision-making process into distinct evaluation modules. Each module assesses a specific aspect (visibility evaluation, gradient evaluation, surface condition evaluation, collision risk evaluation), allowing comprehensive assessment while maintaining manageable system complexity through modular design.
Solution Approach 2:
The system uses a universal evaluation framework that can assess multiple different factors (visibility, gradient, surface conditions, collision risks) using a common set of sensors and processing algorithms. This multi-functional approach allows comprehensive safety evaluation without requiring separate specialized systems for each factor.
Data Source
AI summary
In an evacuation travelling assistance apparatus, a risk determining unit determines, when a driver is not in a state capable of appropriately performing driving operations, a risk involved in stopping at a location and a risk involved in passing through the location, for each of a plurality of locations that may serve as an advancing destination of the own vehicle, based on map information, own vehicle information, and peripheral environment information. An evacuation destination setting unit sets a location at which the risk involved in stopping at the location is lower than a predetermined reference as an evacuation destination, based on the determined risk. An evacuation route setting unit combines locations at which the risk involved in passing through the location is lower than a predetermined reference, based on the determined risk, and sets an evacuation route from the current position of the own vehicle to the evacuation destination.