AJA Architectural Design & Services

28/01/2026

06/01/2026

Ongoing Construction of One-Storey Commercial Building
Dasitam, Baclayon, Bohol

13/11/2025

📐 UNDERSTANDING TURNING RADIUS IN ROAD DESIGN
The image you provided illustrates two different approaches to designing a T-intersection specifically highlighting the importance of the turning radius for vehicle maneuverability. The goal is to ensure a smooth safe and efficient turn.
The image compares a poor design (❌ Left) with a good design (✅ Right) using dimensions (likely in millimeters though not explicitly stated standard design measurements like 3500 5000 and 6000 suggest this scale) and angles.

❌ POOR DESIGN (LEFT SIDE)
This design shows a standard T-intersection where the roads meet at a sharp 90-degree corner.
* Sharp Corner and Angle: The vehicle attempting to turn has to make a very sharp turn. The diagram shows the path of the car during the turn is constricted likely requiring a multiple-point turn or mounting the curb.
* The sharp inner corner geometry is indicated by an angle of 27° for the road edge which is insufficient for a smooth vehicle path.
* Insufficient Space:
* The horizontal road has a width of 3500.
* The vertical road has a width of 3500.
* The distance between the vehicles (parked and turning) on the horizontal road is only 1000 (likely representing the clearance between a parked car and the turning path) which is extremely tight.
* The straight approach distance on the vertical road is 5000.
* Result: The "❌" indicates this design is inadequate. A large vehicle would struggle to complete the turn in one motion without crossing into the opposite lane or hitting the curb/parked vehicle creating a hazardous situation.

✅ GOOD DESIGN (RIGHT SIDE)
This design incorporates a proper turning radius to facilitate a smoother and safer turn.
* Curved Corner and Angle: The sharp corner is replaced with a curved edge (known as a corner radius or fillet).
* The road edge is eased by an angle of 45° which is much shallower than the 27° in the poor design allowing the car to cut the corner more smoothly.
* Dedicated Turning Radius: The key feature is the circle indicating the turning path.
* It specifies a Turning Radius of 3000 (likely 3 meters or 3000 mm) which is the minimum radius required for a standard vehicle to comfortably complete the turn.
* The road's corner is constructed to match or exceed this required radius.
* Sufficient Space:
* The road widths remain the same (3500).
* The straight approach distance on the vertical road is longer at 6000 giving more room for the car to align before the turn.
* The clearance for the parked car is also implied to be better due to the wider turning path though no specific clearance dimension is given the 3000 mm radius dictates the entire maneuver.
* Result: The "✅" indicates this design is appropriate. The car can execute the turn smoothly and safely while maintaining clearance from obstacles like parked cars or street furniture.
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The photo is a simple but effective illustration used in architectural or civil engineering contexts to demonstrate that adequate turning radius is a critical factor in functional road design ensuring that vehicles can navigate intersections easily and safely.

26/07/2025

Two Units, Two-Storey Apartment Building
St. Joseph Village, Tagbilaran City
For Your Plans & Design Hire an Architect!

17/07/2025

Proposed Inland Resort
Puerto Princesa City, Palawan

15/07/2025

Proposed Improvement of Memorial Park

10/05/2025

06/02/2025

Project : Proposed Two-Bedroom, One-Storey Residential Bldg.
Location : Tanday, Corella, Bohol
Status : For Building Permit
For Your Plans & Design Hire an Architect!

06/02/2025

Project : Propose Three-Bedroom, One-Storey Residential Building
Location : Tanday, Corella, Bohol
Status : For Building Permit
For Your Plans & Design Hire an Architect!