Display CO2 savings for walking and cycling routes in detail view #5199

Description:

For Public Transport and Intermodal Routes, the overview displays the CO2 emissions, and the detail view additionally shows how much CO2 is saved compared to a car trip. However, for walking and cycling routes, this information is missing in the detail view.

It would be great to also show the CO2 savings compared to a car trip in the detail view for walking and cycling routes. (See attached screenshots for reference.)

Steps to reproduce:

1. Perform a route search, e.g. https://opas.matka.fi/reitti/Piitie%201%2C%20Vantaa%3A%3A60.291831728250386%2C24.987936615943912/Kaunokkitie%209%2C%20Vantaa%3A%3A60.29857301873039%2C25.002350807189945?locale=en&time=1733997446
2. Compare the information displayed in the detail view for:
   • Public transport or intermodal routes (CO2 emissions and savings shown).
   • Walking or cycling routes (no CO2 savings displayed).

Observed behavior:

CO2 savings compared to a car trip are not displayed in the detail view for walking and cycling routes.

Expected behavior:

The detail view for walking and cycling routes should include CO2 savings information, similar to other route types.

Screenshots:

Environment:

• Browser: Edge

Additional information:

Adding CO2 savings information for walking and cycling routes would highlight their environmental benefits and encourage users to choose sustainable travel modes.