System for collision prevention

1 . A computer system for preventing collisions between a first and a second vehicle operating at a work site, the system comprising a control unit arranged in communication with the first and the second vehicle, wherein the control unit is adapted to:

receive a first information package from the first vehicle, the first information package comprising an indication of a first location of the first vehicle,

identify a communication disruption between the first vehicle and the control unit,

form, upon identification of the communication disruption, a permission zone for the second vehicle based on the first location of the first vehicle and a maximum stopping distance for the second vehicle, and

transmit a second information package to the second vehicle, the second information package comprising an instruction to the second vehicle for not entering the permission zone wherein the second vehicle is controlled to comply with the instruction by altering its route to avoid entering the permission zone, thereby restricting movement to avoid collision between the first and the second vehicle.

2 . The system according to claim 1 , wherein the control unit is further adapted to:

identify a re-established communication between the first vehicle and the control unit,

receive a third information package from the first vehicle, the third information package comprising an indication of a second location of the first vehicle,

determine a difference between the first and the second location for the first vehicle,

transmit, only if the determined difference is larger than a first threshold, a fourth information package to the second vehicle, the fourth information package comprising an instruction to allow the second vehicle to enter the permission zone.

3 . The system according to claim 1 , wherein the control unit is adapted to identify the communication disruption by:

determining a duration since the last received indication of the location of the first vehicle,

determining if the determined duration is larger than a second threshold.

4 . The system according to claim 3 , wherein the second threshold is less than 1 minute.

5 . The system according to claim 1 , wherein the first location of the first vehicle is received from a geolocation arrangement comprised with the first vehicle.

6 . The system according to claim 1 , wherein the first and the second vehicle are working machines.

7 . The system according to claim 1 , wherein the control unit forms part of a common server arranged remotely from the first and the second vehicle.

8 . The system according to claim 1 , wherein the control unit is provided as an onboard component of the second vehicle.

9 . A work site arrangement, comprising:

a computer system according to claim 1 , and

the first and the second vehicle.

10 . A computer implemented method for preventing collisions between a first and a second vehicle operating at a work site, the first and the second vehicle arranged in communication with a control system comprising a control unit, wherein the method comprises:

receiving, at the control unit, a first information package from the first vehicle, the first information package comprising an indication of a first location of the first vehicle,

identifying a communication disruption between the first vehicle and the control unit,

form, upon identification of the communication disruption, a permission zone for the second vehicle based on the first location of the first vehicle and a maximum stopping distance for the second vehicle, and

transmitting a second information package to the second vehicle, the second information package comprising an instruction to the second vehicle for not entering the permission zone wherein the second vehicle is controlled to comply with the instruction by altering its route to avoid entering the permission zone, thereby restricting movement to avoid collision between the first and the second vehicle.

11 . The method according to claim 10 , further comprising:

identifying, using the control unit, a re-established communication between the first vehicle and the control unit,

receiving, at the control unit, a third information package from the first vehicle, the third information package comprising an indication of a second location of the first vehicle,

determining, using the control unit, a difference between the first and the second location for the first vehicle,

transmitting, using the control unit and only if the determined difference is larger than a first threshold, a fourth information package to the second vehicle, the fourth information package comprising an instruction to allow the second first vehicle to enter the permission zone.

12 . The method according to claim 10 , wherein the communication disruption is identified by:

determining, using the control unit, a duration between two consecutively received indications of locations for the first vehicle,

determining, using the control unit, if the determined duration is larger than a second threshold.

13 . The method according to claim 12 , wherein the second threshold is less than 1 minute.

14 . A computer program product comprising a non-transitory computer readable medium having stored thereon computer program means for operating a control system for preventing collisions between a first and a second vehicle operating at a work site, the system comprising a control unit arranged in communication with the first and the second vehicle, wherein the computer program product comprises:

code for receiving, at the control unit, a first information package from the first vehicle, the first information package comprising an indication of a first location of the first vehicle,

code for identifying, using the control unit, a communication disruption between the first vehicle and the control unit,

form, upon identification of the communication disruption, a permission zone for the second vehicle based on the first location of the first vehicle and a maximum stopping distance for the second vehicle, and

code for transmitting a second information package to the second vehicle, the second information package comprising an instruction to the second vehicle for not entering the permission zone wherein the second vehicle is controlled to comply with the instruction by altering its route to avoid entering the permission zone, thereby restricting movement to avoid collision between the first and the second vehicle.